"flat" meaning in Middle English

{
  "descendants": [
    {
      "lang": "English",
      "lang_code": "en",
      "word": "flat"
    },
    {
      "lang": "Yola",
      "lang_code": "yol",
      "word": "vlat"
    }
  ],
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      "args": {
        "1": "enm",
        "2": ":bor",
        "3": "non:flatr"
      },
      "expansion": "[Appendix:Glossary#loanword|Borrowed]] from\", \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*flataz\", \"status\" : \"missing\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Old Norse\", \"term\" : \"flatr\", \"status\" : \"ok\", \"lang\" : \"non\" } ], \"keyword\" : \"bor\" } ], \"lang_name\" : \"Middle English\", \"term\" : \"flat\", \"status\" : \"ok\", \"lang\" : \"enm\" }\" data-lang=\"enm\" data-title=\"flat\">",
      "name": "etymon"
    },
    {
      "args": {
        "1": "enm",
        "2": "non",
        "3": "flatr"
      },
      "expansion": "Old Norse flatr",
      "name": "bor"
    },
    {
      "args": {
        "1": "enm",
        "2": "gem-pro",
        "3": "*flataz"
      },
      "expansion": "Proto-Germanic *flataz",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Norse flatr, from Proto-Germanic *flataz.",
  "forms": [
    {
      "form": "flatt",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "flatte",
      "tags": [
        "alternative"
      ]
    }
  ],
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        "10": "{{{3}}}",
        "11": "",
        "12": "{{{sup2}}}",
        "2": "adjective",
        "3": "",
        "4": "{{{1}}}",
        "5": "",
        "6": "{{{2}}}",
        "7": "",
        "8": "{{{comp2}}}",
        "9": "",
        "f3l": "",
        "f5l": "",
        "head": ""
      },
      "expansion": "flat",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "flat",
      "name": "enm-adj"
    }
  ],
  "lang": "Middle English",
  "lang_code": "enm",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
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          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 11 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "level, even, smooth"
      ],
      "id": "en-flat-enm-adj-MOeXiYGU",
      "links": [
        [
          "level",
          "level"
        ],
        [
          "even",
          "even"
        ],
        [
          "smooth",
          "smooth"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/flat/"
    }
  ],
  "word": "flat"
}

{
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    "Pages with 11 entries",
    "Pages with entries"
  ],
  "descendants": [
    {
      "lang": "English",
      "lang_code": "en",
      "word": "flat"
    },
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      "lang": "Yola",
      "lang_code": "yol",
      "word": "vlat"
    }
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  "etymology_templates": [
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      "args": {
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      "args": {
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      "expansion": "Old Norse flatr",
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      "args": {
        "1": "enm",
        "2": "gem-pro",
        "3": "*flataz"
      },
      "expansion": "Proto-Germanic *flataz",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Norse flatr, from Proto-Germanic *flataz.",
  "forms": [
    {
      "form": "flatt",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "flatte",
      "tags": [
        "alternative"
      ]
    }
  ],
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      },
      "expansion": "flat",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "flat",
      "name": "enm-adj"
    }
  ],
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  "lang_code": "enm",
  "pos": "adj",
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    {
      "categories": [
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        "Middle English entries with incorrect language header",
        "Middle English lemmas",
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        "Middle English terms derived from Proto-Germanic",
        "Pages using etymon with no ID",
        "Pages with 11 entries",
        "Pages with entries"
      ],
      "glosses": [
        "level, even, smooth"
      ],
      "links": [
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        ],
        [
          "even",
          "even"
        ],
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          "smooth",
          "smooth"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/flat/"
    }
  ],
  "word": "flat"
}