"half-life" meaning in English

See half-life in All languages combined, or Wiktionary

Noun

IPA: /ˈhæfˌlaɪf/ [US] Audio: LL-Q1860 (eng)-Persent101-half-life.wav [US] Forms: half-lives [plural]
Etymology: half- + life Etymology templates: {{prefix|en|half|life}} half- + life Head templates: {{en-noun|half-lives}} half-life (plural half-lives)
  1. (physics) The time required for half the nuclei in a sample of an isotope to undergo radioactive decay. Categories (topical): Physics, Radioactivity, Time Translations (time in physics): կիսատրոհման պարբերություն (kisatrohman parberutʿyun) (Armenian), yarımdağılma dövrü (Azerbaijani), перыяд паўраспаду (pjeryjad paŭraspadu) [neuter] (Belarusian), период на полуразпад (period na polurazpad) [masculine] (Bulgarian), període de semidesintegració [masculine] (Catalan), període radioactiu [masculine] (Catalan), 半衰期 (bànshuāiqī) (Chinese Mandarin), poločas rozpadu [masculine] (Czech), halveringstid [common-gender] (Danish), halfwaardetijd [masculine] (Dutch), halveringstijd [masculine] (Dutch), duoniĝa tempo (Esperanto), poolestusaeg (Estonian), puoliintumisaika (Finnish), demi-vie [feminine] (French), período de semidesintegración [masculine] (Galician), ნახევარდაშლის პერიოდი (naxevardašlis ṗeriodi) (Georgian), ნახევრად დაშლის პერიოდი (naxevrad dašlis ṗeriodi) (Georgian), Halbwertszeit [feminine] (German), χρόνος ημιζωής (chrónos imizoḯs) [masculine] (Greek), अर्धायु काल (ardhāyu kāl) (Hindi), felezési idő (Hungarian), helmingunartími (Icelandic), waktu paruh (Indonesian), leathré [feminine] (Irish), emivita [feminine] (Italian), semivita [feminine] (Italian), 半減期 (hangenki) (alt: はんげんき) (Japanese), ಅರ್ಧಾಯುಷ್ಯ (ardhāyuṣya) (Kannada), жартылай ыдырау мерзімі (jartylai ydyrau merzımı) (Kazakh), 반감기 (ban'gamgi) (Korean), pussabrukšanas periods (Latvian), pusėjimo trukmė (Lithuanian), период на полураспад (period na poluraspad) [masculine] (Macedonian), separuh hayat (Malay), അർദ്ധായുസ്സ് (aṟddhāyussŭ) (Malayalam), halveringstid [feminine, masculine] (Norwegian Bokmål), halveringstid [feminine] (Norwegian Nynorsk), نیمهعمر (nime-'omr) (Persian), czas połowicznego rozpadu [masculine] (Polish), okres połowicznego rozpadu [masculine] (Polish), meia-vida [feminine] (Portuguese), semivida [feminine] (Portuguese), perioadă de înjumătățire [feminine] (Romanian), пери́од полураспа́да (períod poluraspáda) [masculine] (Russian), vreme poluraspada [Roman, neuter] (Serbo-Croatian), polčas premeny [masculine] (Slovak), razpolovni čas [masculine] (Slovene), periodo de semidesintegración [masculine] (Spanish), semivida [feminine] (Spanish), vida media [feminine] (Spanish), halveringstid [common-gender] (Swedish), kalahatimbuhay (Tagalog), அரைவாழ்வுக் காலம் (araivāḻvuk kālam) (Tamil), అర్థ జీవితకాలం (artha jīvitakālaṁ) (Telugu), ครึ่งชีวิต (Thai), пері́од напівро́зпаду (períod napivrózpadu) [masculine] (Ukrainian), yarim yemirilish davri (Uzbek), chu kì bán rã (Vietnamese), chu kỳ bán rã (Vietnamese), chu kỳ nửa phân rã (Vietnamese)
    Sense id: en-half-life-en-noun-yQIEIhfg Disambiguation of Radioactivity: 40 22 24 14 Disambiguation of Time: 27 23 25 26 Categories (other): English entries with language name categories using raw markup, English terms prefixed with half-, English terms with non-redundant non-automated sortkeys Disambiguation of English entries with language name categories using raw markup: 25 31 26 18 Disambiguation of English terms prefixed with half-: 25 30 23 21 Disambiguation of English terms with non-redundant non-automated sortkeys: 27 29 22 22 Topics: natural-sciences, physical-sciences, physics Disambiguation of 'time in physics': 39 20 21 19
  2. (chemistry) In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value. Categories (topical): Chemistry, Time
    Sense id: en-half-life-en-noun-8wD7eRzO Disambiguation of Time: 27 23 25 26 Categories (other): English entries with incorrect language header, English entries with language name categories using raw markup, English terms prefixed with half-, English terms with non-redundant non-automated sortkeys, Physical quantities Disambiguation of English entries with incorrect language header: 23 34 22 21 Disambiguation of English entries with language name categories using raw markup: 25 31 26 18 Disambiguation of English terms prefixed with half-: 25 30 23 21 Disambiguation of English terms with non-redundant non-automated sortkeys: 27 29 22 22 Disambiguation of Physical quantities: 28 38 17 17 Topics: chemistry, natural-sciences, physical-sciences
  3. (medicine) The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity. Categories (topical): Medicine, Time Translations (medicine: time for a substance to lose half of its activity): semivida [feminine] (Catalan), puoliintumisaika (Finnish), waktu paruh (Indonesian), 半減期 (hangenki) (alt: はんげんき) (Japanese), separuh hayat (Malay), halveringstid [feminine, masculine] (Norwegian Bokmål), halveringstid [feminine] (Norwegian Nynorsk), пери́од полувыведе́ния (períod poluvyvedénija) [masculine] (Russian)
    Sense id: en-half-life-en-noun-i5kkIgI- Disambiguation of Time: 27 23 25 26 Categories (other): English entries with language name categories using raw markup, English terms prefixed with half-, English terms with non-redundant non-automated sortkeys Disambiguation of English entries with language name categories using raw markup: 25 31 26 18 Disambiguation of English terms prefixed with half-: 25 30 23 21 Disambiguation of English terms with non-redundant non-automated sortkeys: 27 29 22 22 Topics: medicine, sciences Disambiguation of 'medicine: time for a substance to lose half of its activity': 17 14 43 26
  4. The time it takes for an idea or a fashion to lose half of its influential power. Categories (topical): Time Translations (time to lose half of influential power of an idea or fashion): puoliintumisaika (Finnish)
    Sense id: en-half-life-en-noun-QgVvoO90 Disambiguation of Time: 27 23 25 26 Categories (other): English entries with language name categories using raw markup, English terms prefixed with half-, English terms with non-redundant non-automated sortkeys Disambiguation of English entries with language name categories using raw markup: 25 31 26 18 Disambiguation of English terms prefixed with half-: 25 30 23 21 Disambiguation of English terms with non-redundant non-automated sortkeys: 27 29 22 22 Disambiguation of 'time to lose half of influential power of an idea or fashion': 17 15 27 40
The following are not (yet) sense-disambiguated
Translations (chemistry: time required for concentration to fall to half): semivida [feminine] (Catalan), puoliintumisaika (Finnish), demi-vie [feminine] (French), Halbwertszeit [feminine] (German), felezési idő (Hungarian), waktu paruh (Indonesian), emivita [feminine] (Italian), semivita [feminine] (Italian), 半減期 (hangenki) (alt: はんげんき) (Japanese), separuh hayat (Malay), пери́од полужи́зни (períod polužízni) [masculine] (Russian), semivida (Spanish), kalahatimbuhay (Tagalog)
Disambiguation of 'chemistry: time required for concentration to fall to half': 28 34 19 19

Inflected forms

Alternative forms

Download JSON data for half-life meaning in English (19.1kB)

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  "etymology_text": "half- + life",
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      "glosses": [
        "The time required for half the nuclei in a sample of an isotope to undergo radioactive decay."
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      "id": "en-half-life-en-noun-yQIEIhfg",
      "links": [
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        "(physics) The time required for half the nuclei in a sample of an isotope to undergo radioactive decay."
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        "natural-sciences",
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      "translations": [
        {
          "_dis1": "39 20 21 19",
          "code": "hy",
          "lang": "Armenian",
          "roman": "kisatrohman parberutʿyun",
          "sense": "time in physics",
          "word": "կիսատրոհման պարբերություն"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "az",
          "lang": "Azerbaijani",
          "sense": "time in physics",
          "word": "yarımdağılma dövrü"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "be",
          "lang": "Belarusian",
          "roman": "pjeryjad paŭraspadu",
          "sense": "time in physics",
          "tags": [
            "neuter"
          ],
          "word": "перыяд паўраспаду"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "bg",
          "lang": "Bulgarian",
          "roman": "period na polurazpad",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "период на полуразпад"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ca",
          "lang": "Catalan",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "període de semidesintegració"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ca",
          "lang": "Catalan",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "període radioactiu"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "bànshuāiqī",
          "sense": "time in physics",
          "word": "半衰期"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "cs",
          "lang": "Czech",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "poločas rozpadu"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "da",
          "lang": "Danish",
          "sense": "time in physics",
          "tags": [
            "common-gender"
          ],
          "word": "halveringstid"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "nl",
          "lang": "Dutch",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "halfwaardetijd"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "nl",
          "lang": "Dutch",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "halveringstijd"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "eo",
          "lang": "Esperanto",
          "sense": "time in physics",
          "word": "duoniĝa tempo"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "et",
          "lang": "Estonian",
          "sense": "time in physics",
          "word": "poolestusaeg"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "fi",
          "lang": "Finnish",
          "sense": "time in physics",
          "word": "puoliintumisaika"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "fr",
          "lang": "French",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "demi-vie"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "gl",
          "lang": "Galician",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "período de semidesintegración"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ka",
          "lang": "Georgian",
          "roman": "naxevardašlis ṗeriodi",
          "sense": "time in physics",
          "word": "ნახევარდაშლის პერიოდი"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ka",
          "lang": "Georgian",
          "roman": "naxevrad dašlis ṗeriodi",
          "sense": "time in physics",
          "word": "ნახევრად დაშლის პერიოდი"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "de",
          "lang": "German",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "Halbwertszeit"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "el",
          "lang": "Greek",
          "roman": "chrónos imizoḯs",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "χρόνος ημιζωής"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "hi",
          "lang": "Hindi",
          "roman": "ardhāyu kāl",
          "sense": "time in physics",
          "word": "अर्धायु काल"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "hu",
          "lang": "Hungarian",
          "sense": "time in physics",
          "word": "felezési idő"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "is",
          "lang": "Icelandic",
          "sense": "time in physics",
          "word": "helmingunartími"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "id",
          "lang": "Indonesian",
          "sense": "time in physics",
          "word": "waktu paruh"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ga",
          "lang": "Irish",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "leathré"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "it",
          "lang": "Italian",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "emivita"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "it",
          "lang": "Italian",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "semivita"
        },
        {
          "_dis1": "39 20 21 19",
          "alt": "はんげんき",
          "code": "ja",
          "lang": "Japanese",
          "roman": "hangenki",
          "sense": "time in physics",
          "word": "半減期"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "kn",
          "lang": "Kannada",
          "roman": "ardhāyuṣya",
          "sense": "time in physics",
          "word": "ಅರ್ಧಾಯುಷ್ಯ"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "kk",
          "lang": "Kazakh",
          "roman": "jartylai ydyrau merzımı",
          "sense": "time in physics",
          "word": "жартылай ыдырау мерзімі"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ko",
          "lang": "Korean",
          "roman": "ban'gamgi",
          "sense": "time in physics",
          "word": "반감기"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "lv",
          "lang": "Latvian",
          "sense": "time in physics",
          "word": "pussabrukšanas periods"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "lt",
          "lang": "Lithuanian",
          "sense": "time in physics",
          "word": "pusėjimo trukmė"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "mk",
          "lang": "Macedonian",
          "roman": "period na poluraspad",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "период на полураспад"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ms",
          "lang": "Malay",
          "sense": "time in physics",
          "word": "separuh hayat"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ml",
          "lang": "Malayalam",
          "roman": "aṟddhāyussŭ",
          "sense": "time in physics",
          "word": "അർദ്ധായുസ്സ്"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "time in physics",
          "tags": [
            "feminine",
            "masculine"
          ],
          "word": "halveringstid"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "nn",
          "lang": "Norwegian Nynorsk",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "halveringstid"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "fa",
          "lang": "Persian",
          "roman": "nime-'omr",
          "sense": "time in physics",
          "word": "نیمهعمر"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "pl",
          "lang": "Polish",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "czas połowicznego rozpadu"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "pl",
          "lang": "Polish",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "okres połowicznego rozpadu"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "pt",
          "lang": "Portuguese",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "meia-vida"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "pt",
          "lang": "Portuguese",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "semivida"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ro",
          "lang": "Romanian",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "perioadă de înjumătățire"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ru",
          "lang": "Russian",
          "roman": "períod poluraspáda",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "пери́од полураспа́да"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "sh",
          "lang": "Serbo-Croatian",
          "sense": "time in physics",
          "tags": [
            "Roman",
            "neuter"
          ],
          "word": "vreme poluraspada"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "sk",
          "lang": "Slovak",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "polčas premeny"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "sl",
          "lang": "Slovene",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "razpolovni čas"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "es",
          "lang": "Spanish",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "periodo de semidesintegración"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "es",
          "lang": "Spanish",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "semivida"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "es",
          "lang": "Spanish",
          "sense": "time in physics",
          "tags": [
            "feminine"
          ],
          "word": "vida media"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "sv",
          "lang": "Swedish",
          "sense": "time in physics",
          "tags": [
            "common-gender"
          ],
          "word": "halveringstid"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "tl",
          "lang": "Tagalog",
          "sense": "time in physics",
          "word": "kalahatimbuhay"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "ta",
          "lang": "Tamil",
          "roman": "araivāḻvuk kālam",
          "sense": "time in physics",
          "word": "அரைவாழ்வுக் காலம்"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "te",
          "lang": "Telugu",
          "roman": "artha jīvitakālaṁ",
          "sense": "time in physics",
          "word": "అర్థ జీవితకాలం"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "th",
          "lang": "Thai",
          "sense": "time in physics",
          "word": "ครึ่งชีวิต"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "uk",
          "lang": "Ukrainian",
          "roman": "períod napivrózpadu",
          "sense": "time in physics",
          "tags": [
            "masculine"
          ],
          "word": "пері́од напівро́зпаду"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "uz",
          "lang": "Uzbek",
          "sense": "time in physics",
          "word": "yarim yemirilish davri"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "vi",
          "lang": "Vietnamese",
          "sense": "time in physics",
          "word": "chu kì bán rã"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "vi",
          "lang": "Vietnamese",
          "sense": "time in physics",
          "word": "chu kỳ bán rã"
        },
        {
          "_dis1": "39 20 21 19",
          "code": "vi",
          "lang": "Vietnamese",
          "sense": "time in physics",
          "word": "chu kỳ nửa phân rã"
        }
      ]
    },
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      "categories": [
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          "kind": "topical",
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          "_dis": "27 29 22 22",
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          "_dis": "28 38 17 17",
          "kind": "other",
          "langcode": "en",
          "name": "Physical quantities",
          "orig": "en:Physical quantities",
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          "_dis": "27 23 25 26",
          "kind": "topical",
          "langcode": "en",
          "name": "Time",
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            "All topics",
            "Fundamental"
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      ],
      "glosses": [
        "In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value."
      ],
      "id": "en-half-life-en-noun-8wD7eRzO",
      "links": [
        [
          "chemistry",
          "chemistry"
        ]
      ],
      "raw_glosses": [
        "(chemistry) In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
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      "categories": [
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          "name": "Medicine",
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        {
          "_dis": "27 29 22 22",
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          "_dis": "27 23 25 26",
          "kind": "topical",
          "langcode": "en",
          "name": "Time",
          "orig": "en:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity."
      ],
      "id": "en-half-life-en-noun-i5kkIgI-",
      "links": [
        [
          "medicine",
          "medicine"
        ]
      ],
      "raw_glosses": [
        "(medicine) The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity."
      ],
      "topics": [
        "medicine",
        "sciences"
      ],
      "translations": [
        {
          "_dis1": "17 14 43 26",
          "code": "ca",
          "lang": "Catalan",
          "sense": "medicine: time for a substance to lose half of its activity",
          "tags": [
            "feminine"
          ],
          "word": "semivida"
        },
        {
          "_dis1": "17 14 43 26",
          "code": "fi",
          "lang": "Finnish",
          "sense": "medicine: time for a substance to lose half of its activity",
          "word": "puoliintumisaika"
        },
        {
          "_dis1": "17 14 43 26",
          "code": "id",
          "lang": "Indonesian",
          "sense": "medicine: time for a substance to lose half of its activity",
          "word": "waktu paruh"
        },
        {
          "_dis1": "17 14 43 26",
          "alt": "はんげんき",
          "code": "ja",
          "lang": "Japanese",
          "roman": "hangenki",
          "sense": "medicine: time for a substance to lose half of its activity",
          "word": "半減期"
        },
        {
          "_dis1": "17 14 43 26",
          "code": "ms",
          "lang": "Malay",
          "sense": "medicine: time for a substance to lose half of its activity",
          "word": "separuh hayat"
        },
        {
          "_dis1": "17 14 43 26",
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "medicine: time for a substance to lose half of its activity",
          "tags": [
            "feminine",
            "masculine"
          ],
          "word": "halveringstid"
        },
        {
          "_dis1": "17 14 43 26",
          "code": "nn",
          "lang": "Norwegian Nynorsk",
          "sense": "medicine: time for a substance to lose half of its activity",
          "tags": [
            "feminine"
          ],
          "word": "halveringstid"
        },
        {
          "_dis1": "17 14 43 26",
          "code": "ru",
          "lang": "Russian",
          "roman": "períod poluvyvedénija",
          "sense": "medicine: time for a substance to lose half of its activity",
          "tags": [
            "masculine"
          ],
          "word": "пери́од полувыведе́ния"
        }
      ]
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          "_dis": "25 31 26 18",
          "kind": "other",
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        },
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          "_dis": "25 30 23 21",
          "kind": "other",
          "name": "English terms prefixed with half-",
          "parents": [],
          "source": "w+disamb"
        },
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          "_dis": "27 29 22 22",
          "kind": "other",
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          "parents": [
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        },
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          "_dis": "27 23 25 26",
          "kind": "topical",
          "langcode": "en",
          "name": "Time",
          "orig": "en:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1991, Robert Ackerman, Introduction to Jane Ellen Harrison's Prolegomena to the Study of Greek Religion (1903)",
          "text": "Most books of scholarship have surprisingly short intellectual half-lives during which they make a difference\""
        }
      ],
      "glosses": [
        "The time it takes for an idea or a fashion to lose half of its influential power."
      ],
      "id": "en-half-life-en-noun-QgVvoO90",
      "translations": [
        {
          "_dis1": "17 15 27 40",
          "code": "fi",
          "lang": "Finnish",
          "sense": "time to lose half of influential power of an idea or fashion",
          "word": "puoliintumisaika"
        }
      ]
    }
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      "ipa": "/ˈhæfˌlaɪf/",
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  "translations": [
    {
      "_dis1": "28 34 19 19",
      "code": "ca",
      "lang": "Catalan",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "semivida"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "fi",
      "lang": "Finnish",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "puoliintumisaika"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "fr",
      "lang": "French",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "demi-vie"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "de",
      "lang": "German",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "Halbwertszeit"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "hu",
      "lang": "Hungarian",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "felezési idő"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "id",
      "lang": "Indonesian",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "waktu paruh"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "it",
      "lang": "Italian",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "emivita"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "it",
      "lang": "Italian",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "semivita"
    },
    {
      "_dis1": "28 34 19 19",
      "alt": "はんげんき",
      "code": "ja",
      "lang": "Japanese",
      "roman": "hangenki",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "半減期"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "ms",
      "lang": "Malay",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "separuh hayat"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "ru",
      "lang": "Russian",
      "roman": "períod polužízni",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "masculine"
      ],
      "word": "пери́од полужи́зни"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "es",
      "lang": "Spanish",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "semivida"
    },
    {
      "_dis1": "28 34 19 19",
      "code": "tl",
      "lang": "Tagalog",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "kalahatimbuhay"
    }
  ],
  "wikipedia": [
    "half-life"
  ],
  "word": "half-life"
}
{
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    "English nouns",
    "English nouns with irregular plurals",
    "English terms prefixed with half-",
    "English terms with IPA pronunciation",
    "English terms with audio links",
    "English terms with non-redundant non-automated sortkeys",
    "Requests for review of Afrikaans translations",
    "Requests for review of Hebrew translations",
    "Requests for review of Turkish translations",
    "Requests for review of Urdu translations",
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    "en:Radioactivity",
    "en:Time"
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  "etymology_templates": [
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      "args": {
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        "2": "half",
        "3": "life"
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      "expansion": "half- + life",
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  ],
  "etymology_text": "half- + life",
  "forms": [
    {
      "form": "half-lives",
      "tags": [
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  ],
  "head_templates": [
    {
      "args": {
        "1": "half-lives"
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      "expansion": "half-life (plural half-lives)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "en:Physics"
      ],
      "glosses": [
        "The time required for half the nuclei in a sample of an isotope to undergo radioactive decay."
      ],
      "links": [
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          "physics"
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          "nucleus"
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        [
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          "isotope"
        ],
        [
          "radioactive decay",
          "radioactive decay"
        ]
      ],
      "raw_glosses": [
        "(physics) The time required for half the nuclei in a sample of an isotope to undergo radioactive decay."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    },
    {
      "categories": [
        "en:Chemistry"
      ],
      "glosses": [
        "In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value."
      ],
      "links": [
        [
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          "chemistry"
        ]
      ],
      "raw_glosses": [
        "(chemistry) In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value."
      ],
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        "chemistry",
        "natural-sciences",
        "physical-sciences"
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    {
      "categories": [
        "en:Medicine"
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      "glosses": [
        "The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity."
      ],
      "links": [
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          "medicine"
        ]
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      "raw_glosses": [
        "(medicine) The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity."
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        "sciences"
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    },
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      "examples": [
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          "ref": "1991, Robert Ackerman, Introduction to Jane Ellen Harrison's Prolegomena to the Study of Greek Religion (1903)",
          "text": "Most books of scholarship have surprisingly short intellectual half-lives during which they make a difference\""
        }
      ],
      "glosses": [
        "The time it takes for an idea or a fashion to lose half of its influential power."
      ]
    }
  ],
  "sounds": [
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      "ipa": "/ˈhæfˌlaɪf/",
      "tags": [
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  "translations": [
    {
      "code": "hy",
      "lang": "Armenian",
      "roman": "kisatrohman parberutʿyun",
      "sense": "time in physics",
      "word": "կիսատրոհման պարբերություն"
    },
    {
      "code": "az",
      "lang": "Azerbaijani",
      "sense": "time in physics",
      "word": "yarımdağılma dövrü"
    },
    {
      "code": "be",
      "lang": "Belarusian",
      "roman": "pjeryjad paŭraspadu",
      "sense": "time in physics",
      "tags": [
        "neuter"
      ],
      "word": "перыяд паўраспаду"
    },
    {
      "code": "bg",
      "lang": "Bulgarian",
      "roman": "period na polurazpad",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "период на полуразпад"
    },
    {
      "code": "ca",
      "lang": "Catalan",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "període de semidesintegració"
    },
    {
      "code": "ca",
      "lang": "Catalan",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "període radioactiu"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "bànshuāiqī",
      "sense": "time in physics",
      "word": "半衰期"
    },
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "poločas rozpadu"
    },
    {
      "code": "da",
      "lang": "Danish",
      "sense": "time in physics",
      "tags": [
        "common-gender"
      ],
      "word": "halveringstid"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "halfwaardetijd"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "halveringstijd"
    },
    {
      "code": "eo",
      "lang": "Esperanto",
      "sense": "time in physics",
      "word": "duoniĝa tempo"
    },
    {
      "code": "et",
      "lang": "Estonian",
      "sense": "time in physics",
      "word": "poolestusaeg"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "time in physics",
      "word": "puoliintumisaika"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "demi-vie"
    },
    {
      "code": "gl",
      "lang": "Galician",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "período de semidesintegración"
    },
    {
      "code": "ka",
      "lang": "Georgian",
      "roman": "naxevardašlis ṗeriodi",
      "sense": "time in physics",
      "word": "ნახევარდაშლის პერიოდი"
    },
    {
      "code": "ka",
      "lang": "Georgian",
      "roman": "naxevrad dašlis ṗeriodi",
      "sense": "time in physics",
      "word": "ნახევრად დაშლის პერიოდი"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "Halbwertszeit"
    },
    {
      "code": "el",
      "lang": "Greek",
      "roman": "chrónos imizoḯs",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "χρόνος ημιζωής"
    },
    {
      "code": "hi",
      "lang": "Hindi",
      "roman": "ardhāyu kāl",
      "sense": "time in physics",
      "word": "अर्धायु काल"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "time in physics",
      "word": "felezési idő"
    },
    {
      "code": "is",
      "lang": "Icelandic",
      "sense": "time in physics",
      "word": "helmingunartími"
    },
    {
      "code": "id",
      "lang": "Indonesian",
      "sense": "time in physics",
      "word": "waktu paruh"
    },
    {
      "code": "ga",
      "lang": "Irish",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "leathré"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "emivita"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "semivita"
    },
    {
      "alt": "はんげんき",
      "code": "ja",
      "lang": "Japanese",
      "roman": "hangenki",
      "sense": "time in physics",
      "word": "半減期"
    },
    {
      "code": "kn",
      "lang": "Kannada",
      "roman": "ardhāyuṣya",
      "sense": "time in physics",
      "word": "ಅರ್ಧಾಯುಷ್ಯ"
    },
    {
      "code": "kk",
      "lang": "Kazakh",
      "roman": "jartylai ydyrau merzımı",
      "sense": "time in physics",
      "word": "жартылай ыдырау мерзімі"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "ban'gamgi",
      "sense": "time in physics",
      "word": "반감기"
    },
    {
      "code": "lv",
      "lang": "Latvian",
      "sense": "time in physics",
      "word": "pussabrukšanas periods"
    },
    {
      "code": "lt",
      "lang": "Lithuanian",
      "sense": "time in physics",
      "word": "pusėjimo trukmė"
    },
    {
      "code": "mk",
      "lang": "Macedonian",
      "roman": "period na poluraspad",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "период на полураспад"
    },
    {
      "code": "ms",
      "lang": "Malay",
      "sense": "time in physics",
      "word": "separuh hayat"
    },
    {
      "code": "ml",
      "lang": "Malayalam",
      "roman": "aṟddhāyussŭ",
      "sense": "time in physics",
      "word": "അർദ്ധായുസ്സ്"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "time in physics",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "halveringstid"
    },
    {
      "code": "nn",
      "lang": "Norwegian Nynorsk",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "halveringstid"
    },
    {
      "code": "fa",
      "lang": "Persian",
      "roman": "nime-'omr",
      "sense": "time in physics",
      "word": "نیمهعمر"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "czas połowicznego rozpadu"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "okres połowicznego rozpadu"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "meia-vida"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "semivida"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "perioadă de înjumătățire"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "períod poluraspáda",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "пери́од полураспа́да"
    },
    {
      "code": "sh",
      "lang": "Serbo-Croatian",
      "sense": "time in physics",
      "tags": [
        "Roman",
        "neuter"
      ],
      "word": "vreme poluraspada"
    },
    {
      "code": "sk",
      "lang": "Slovak",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "polčas premeny"
    },
    {
      "code": "sl",
      "lang": "Slovene",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "razpolovni čas"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "periodo de semidesintegración"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "semivida"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "time in physics",
      "tags": [
        "feminine"
      ],
      "word": "vida media"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "time in physics",
      "tags": [
        "common-gender"
      ],
      "word": "halveringstid"
    },
    {
      "code": "tl",
      "lang": "Tagalog",
      "sense": "time in physics",
      "word": "kalahatimbuhay"
    },
    {
      "code": "ta",
      "lang": "Tamil",
      "roman": "araivāḻvuk kālam",
      "sense": "time in physics",
      "word": "அரைவாழ்வுக் காலம்"
    },
    {
      "code": "te",
      "lang": "Telugu",
      "roman": "artha jīvitakālaṁ",
      "sense": "time in physics",
      "word": "అర్థ జీవితకాలం"
    },
    {
      "code": "th",
      "lang": "Thai",
      "sense": "time in physics",
      "word": "ครึ่งชีวิต"
    },
    {
      "code": "uk",
      "lang": "Ukrainian",
      "roman": "períod napivrózpadu",
      "sense": "time in physics",
      "tags": [
        "masculine"
      ],
      "word": "пері́од напівро́зпаду"
    },
    {
      "code": "uz",
      "lang": "Uzbek",
      "sense": "time in physics",
      "word": "yarim yemirilish davri"
    },
    {
      "code": "vi",
      "lang": "Vietnamese",
      "sense": "time in physics",
      "word": "chu kì bán rã"
    },
    {
      "code": "vi",
      "lang": "Vietnamese",
      "sense": "time in physics",
      "word": "chu kỳ bán rã"
    },
    {
      "code": "vi",
      "lang": "Vietnamese",
      "sense": "time in physics",
      "word": "chu kỳ nửa phân rã"
    },
    {
      "code": "ca",
      "lang": "Catalan",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "semivida"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "puoliintumisaika"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "demi-vie"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "Halbwertszeit"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "felezési idő"
    },
    {
      "code": "id",
      "lang": "Indonesian",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "waktu paruh"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "emivita"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "feminine"
      ],
      "word": "semivita"
    },
    {
      "alt": "はんげんき",
      "code": "ja",
      "lang": "Japanese",
      "roman": "hangenki",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "半減期"
    },
    {
      "code": "ms",
      "lang": "Malay",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "separuh hayat"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "períod polužízni",
      "sense": "chemistry: time required for concentration to fall to half",
      "tags": [
        "masculine"
      ],
      "word": "пери́од полужи́зни"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "semivida"
    },
    {
      "code": "tl",
      "lang": "Tagalog",
      "sense": "chemistry: time required for concentration to fall to half",
      "word": "kalahatimbuhay"
    },
    {
      "code": "ca",
      "lang": "Catalan",
      "sense": "medicine: time for a substance to lose half of its activity",
      "tags": [
        "feminine"
      ],
      "word": "semivida"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "medicine: time for a substance to lose half of its activity",
      "word": "puoliintumisaika"
    },
    {
      "code": "id",
      "lang": "Indonesian",
      "sense": "medicine: time for a substance to lose half of its activity",
      "word": "waktu paruh"
    },
    {
      "alt": "はんげんき",
      "code": "ja",
      "lang": "Japanese",
      "roman": "hangenki",
      "sense": "medicine: time for a substance to lose half of its activity",
      "word": "半減期"
    },
    {
      "code": "ms",
      "lang": "Malay",
      "sense": "medicine: time for a substance to lose half of its activity",
      "word": "separuh hayat"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "medicine: time for a substance to lose half of its activity",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "halveringstid"
    },
    {
      "code": "nn",
      "lang": "Norwegian Nynorsk",
      "sense": "medicine: time for a substance to lose half of its activity",
      "tags": [
        "feminine"
      ],
      "word": "halveringstid"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "períod poluvyvedénija",
      "sense": "medicine: time for a substance to lose half of its activity",
      "tags": [
        "masculine"
      ],
      "word": "пери́од полувыведе́ния"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "time to lose half of influential power of an idea or fashion",
      "word": "puoliintumisaika"
    }
  ],
  "wikipedia": [
    "half-life"
  ],
  "word": "half-life"
}
{
  "called_from": "translations/324",
  "msg": "possible sense number in translation item: Greek: περίοδος ημιζωής m (períodos imizoḯs) (1)",
  "path": [
    "half-life"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "half-life",
  "trace": ""
}

{
  "called_from": "translations/324",
  "msg": "possible sense number in translation item: Icelandic: helmingunartími m (1)",
  "path": [
    "half-life"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "half-life",
  "trace": ""
}

This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2024-05-01 from the enwiktionary dump dated 2024-04-21 using wiktextract (f4fd8c9 and c9440ce). The data shown on this site has been post-processed and various details (e.g., extra categories) removed, some information disambiguated, and additional data merged from other sources. See the raw data download page for the unprocessed wiktextract data.

If you use this data in academic research, please cite Tatu Ylonen: Wiktextract: Wiktionary as Machine-Readable Structured Data, Proceedings of the 13th Conference on Language Resources and Evaluation (LREC), pp. 1317-1325, Marseille, 20-25 June 2022. Linking to the relevant page(s) under https://kaikki.org would also be greatly appreciated.