"four-fifths" meaning in English

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      "expansion": "four-fifths (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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            "Numbers",
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      "glosses": [
        "Four of five equal parts (4/5, ⅘, 0.8)."
      ],
      "id": "en-four-fifths-en-noun-lcoRoWcg",
      "links": [
        [
          "⅘",
          "⅘"
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      ],
      "related": [
        {
          "word": "fraction"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "four-fifths"
}

{
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      "expansion": "four-fifths (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "fraction"
    }
  ],
  "senses": [
    {
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        "English entries with incorrect language header",
        "English fractional numbers",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
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        "Pages with entries"
      ],
      "glosses": [
        "Four of five equal parts (4/5, ⅘, 0.8)."
      ],
      "links": [
        [
          "⅘",
          "⅘"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "four-fifths"
}