"decay constant" meaning in English

{
  "forms": [
    {
      "form": "decay constants",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "decay constant (plural decay constants)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Physical quantities",
          "orig": "en:Physical quantities",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Probability theory",
          "orig": "en:Probability theory",
          "parents": [
            "Mathematical analysis",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Radioactivity",
          "orig": "en:Radioactivity",
          "parents": [
            "Nuclear physics",
            "Radiation",
            "Physics",
            "Quantum mechanics",
            "Energy",
            "Sciences",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Time",
          "orig": "en:Time",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "In a radioactive material, an atom's probability, per unit time, of decaying; it is related to half-life by the equation t_1/2=(ln 2)/λ, where t_1/2 is the half-life, and λ is the decay constant."
      ],
      "id": "en-decay_constant-en-noun-oEEvuG6o",
      "links": [
        [
          "radioactive",
          "radioactive"
        ],
        [
          "half-life",
          "half-life"
        ]
      ]
    }
  ],
  "word": "decay constant"
}

{
  "forms": [
    {
      "form": "decay constants",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "decay constant (plural decay constants)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Physical quantities",
        "en:Probability theory",
        "en:Radioactivity",
        "en:Time"
      ],
      "glosses": [
        "In a radioactive material, an atom's probability, per unit time, of decaying; it is related to half-life by the equation t_1/2=(ln 2)/λ, where t_1/2 is the half-life, and λ is the decay constant."
      ],
      "links": [
        [
          "radioactive",
          "radioactive"
        ],
        [
          "half-life",
          "half-life"
        ]
      ]
    }
  ],
  "word": "decay constant"
}