"once-in-a-lifetime" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "once-in-a-lifetime (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with French translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Hebrew translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Italian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Mandarin translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a once-in-a-lifetime opportunity to travel the world",
          "type": "example"
        }
      ],
      "glosses": [
        "Likely to happen only once in one's lifetime; extremely rare."
      ],
      "id": "en-once-in-a-lifetime-en-adj-JGY3F4L-",
      "related": [
        {
          "word": "never event"
        },
        {
          "word": "once in a blue moon"
        }
      ],
      "synonyms": [
        {
          "word": "of a lifetime"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "qiānzǎinánféng",
          "sense": "Likely to happen only once in one's lifetime",
          "word": "千載難逢 /千载难逢"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Likely to happen only once in one's lifetime",
          "word": "ainutlaatuinen"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "Likely to happen only once in one's lifetime",
          "word": "du siècle"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "Likely to happen only once in one's lifetime",
          "word": "qui ne se présente qu’une fois"
        },
        {
          "code": "he",
          "lang": "Hebrew",
          "roman": "shél pá'am b'khayím",
          "sense": "Likely to happen only once in one's lifetime",
          "word": "של פעם בחיים"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "Likely to happen only once in one's lifetime",
          "word": "più unico che raro"
        }
      ]
    }
  ],
  "word": "once-in-a-lifetime"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "once-in-a-lifetime (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "never event"
    },
    {
      "word": "once in a blue moon"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with usage examples",
        "English uncomparable adjectives",
        "Entries with translation boxes",
        "Mandarin terms with redundant transliterations",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with French translations",
        "Terms with Hebrew translations",
        "Terms with Italian translations",
        "Terms with Mandarin translations"
      ],
      "examples": [
        {
          "text": "a once-in-a-lifetime opportunity to travel the world",
          "type": "example"
        }
      ],
      "glosses": [
        "Likely to happen only once in one's lifetime; extremely rare."
      ],
      "synonyms": [
        {
          "word": "of a lifetime"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "qiānzǎinánféng",
      "sense": "Likely to happen only once in one's lifetime",
      "word": "千載難逢 /千载难逢"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Likely to happen only once in one's lifetime",
      "word": "ainutlaatuinen"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "Likely to happen only once in one's lifetime",
      "word": "du siècle"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "Likely to happen only once in one's lifetime",
      "word": "qui ne se présente qu’une fois"
    },
    {
      "code": "he",
      "lang": "Hebrew",
      "roman": "shél pá'am b'khayím",
      "sense": "Likely to happen only once in one's lifetime",
      "word": "של פעם בחיים"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "Likely to happen only once in one's lifetime",
      "word": "più unico che raro"
    }
  ],
  "word": "once-in-a-lifetime"
}