"threeth" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "three",
        "3": "th"
      },
      "expansion": "three + -th",
      "name": "suffix"
    }
  ],
  "etymology_text": "three + -th",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "threeth (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": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "English ordinal numbers",
          "parents": [
            "Ordinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -th",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Three",
          "orig": "en:Three",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "third."
      ],
      "id": "en-threeth-en-adj-U8NXF1QH",
      "links": [
        [
          "third",
          "third"
        ]
      ],
      "raw_glosses": [
        "(rare, nonstandard) third."
      ],
      "tags": [
        "nonstandard",
        "not-comparable",
        "rare"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-iːθ"
    }
  ],
  "word": "threeth"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "three",
        "3": "th"
      },
      "expansion": "three + -th",
      "name": "suffix"
    }
  ],
  "etymology_text": "three + -th",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "threeth (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English nonstandard terms",
        "English ordinal numbers",
        "English terms suffixed with -th",
        "English terms with rare senses",
        "English uncomparable adjectives",
        "Rhymes:English/iːθ",
        "Rhymes:English/iːθ/1 syllable",
        "en:Three"
      ],
      "glosses": [
        "third."
      ],
      "links": [
        [
          "third",
          "third"
        ]
      ],
      "raw_glosses": [
        "(rare, nonstandard) third."
      ],
      "tags": [
        "nonstandard",
        "not-comparable",
        "rare"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-iːθ"
    }
  ],
  "word": "threeth"
}