"sesquicentenarian" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sesqui",
        "3": "centenarian"
      },
      "expansion": "sesqui- + centenarian",
      "name": "prefix"
    }
  ],
  "etymology_text": "sesqui- + centenarian",
  "forms": [
    {
      "form": "sesquicentenarians",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sesquicentenarian (plural sesquicentenarians)",
      "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",
          "name": "English terms prefixed with sesqui-",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Someone or something of 150 years of age, or between 150 and 159 (in its sixteenth decade of life or existence)"
      ],
      "id": "en-sesquicentenarian-en-noun-FfERznYl",
      "raw_glosses": [
        "(rare) Someone or something of 150 years of age, or between 150 and 159 (in its sixteenth decade of life or existence)"
      ],
      "related": [
        {
          "word": "sesquicentennial"
        },
        {
          "word": "sesquicentenary"
        }
      ],
      "tags": [
        "rare"
      ]
    }
  ],
  "word": "sesquicentenarian"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sesqui",
        "3": "centenarian"
      },
      "expansion": "sesqui- + centenarian",
      "name": "prefix"
    }
  ],
  "etymology_text": "sesqui- + centenarian",
  "forms": [
    {
      "form": "sesquicentenarians",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sesquicentenarian (plural sesquicentenarians)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "sesquicentennial"
    },
    {
      "word": "sesquicentenary"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with sesqui-",
        "English terms with rare senses"
      ],
      "glosses": [
        "Someone or something of 150 years of age, or between 150 and 159 (in its sixteenth decade of life or existence)"
      ],
      "raw_glosses": [
        "(rare) Someone or something of 150 years of age, or between 150 and 159 (in its sixteenth decade of life or existence)"
      ],
      "tags": [
        "rare"
      ]
    }
  ],
  "word": "sesquicentenarian"
}