"plain" meaning in Middle French

{
  "etymology_templates": [
    {
      "args": {
        "1": "frm",
        "2": "fro",
        "3": "plain"
      },
      "expansion": "Old French plain",
      "name": "inh"
    },
    {
      "args": {
        "1": "frm",
        "2": "la",
        "3": "plēnus"
      },
      "expansion": "Latin plēnus",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old French plain, from Latin plēnus.",
  "forms": [
    {
      "form": "plaine",
      "tags": [
        "feminine",
        "singular"
      ]
    },
    {
      "form": "plains",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "plaines",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "10": "{{{mp2}}}",
        "11": "feminine plural",
        "12": "plaines",
        "2": "adjective",
        "3": "",
        "4": "plains",
        "5": "feminine singular",
        "6": "plaine",
        "7": "masculine plural",
        "8": "plains",
        "9": "",
        "f1accel-form": "p",
        "f2accel-form": "f|s",
        "f3accel-form": "m|p",
        "f5accel-form": "f|p",
        "g": "m",
        "g2": "",
        "head": ""
      },
      "expansion": "plain m (feminine singular plaine, masculine plural plains, feminine plural plaines)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "plain m (feminine singular plaine, masculine plural plains, feminine plural plaines)",
      "name": "frm-adj"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 6 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "full (not empty)"
      ],
      "id": "en-plain-frm-adj-GDg4OtSN",
      "links": [
        [
          "full",
          "full"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "plain"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "frm",
        "2": "fro",
        "3": "plain"
      },
      "expansion": "Old French plain",
      "name": "inh"
    },
    {
      "args": {
        "1": "frm",
        "2": "la",
        "3": "plēnus"
      },
      "expansion": "Latin plēnus",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old French plain, from Latin plēnus.",
  "forms": [
    {
      "form": "plaine",
      "tags": [
        "feminine",
        "singular"
      ]
    },
    {
      "form": "plains",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "plaines",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "10": "{{{mp2}}}",
        "11": "feminine plural",
        "12": "plaines",
        "2": "adjective",
        "3": "",
        "4": "plains",
        "5": "feminine singular",
        "6": "plaine",
        "7": "masculine plural",
        "8": "plains",
        "9": "",
        "f1accel-form": "p",
        "f2accel-form": "f|s",
        "f3accel-form": "m|p",
        "f5accel-form": "f|p",
        "g": "m",
        "g2": "",
        "head": ""
      },
      "expansion": "plain m (feminine singular plaine, masculine plural plains, feminine plural plaines)",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "plain m (feminine singular plaine, masculine plural plains, feminine plural plaines)",
      "name": "frm-adj"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Middle French adjectives",
        "Middle French entries with incorrect language header",
        "Middle French lemmas",
        "Middle French terms derived from Latin",
        "Middle French terms derived from Old French",
        "Middle French terms inherited from Latin",
        "Middle French terms inherited from Old French",
        "Pages with 6 entries",
        "Pages with entries"
      ],
      "glosses": [
        "full (not empty)"
      ],
      "links": [
        [
          "full",
          "full"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "plain"
}