"-isoun" meaning in Middle English

{
  "etymology_templates": [
    {
      "args": {
        "1": "enm",
        "2": "fro",
        "3": "-ison"
      },
      "expansion": "Borrowed from Old French -ison",
      "name": "bor+"
    },
    {
      "args": {
        "1": "enm",
        "2": "la",
        "3": "-ātiō",
        "4": "-ātiōnem"
      },
      "expansion": "Latin -ātiōnem",
      "name": "der"
    },
    {
      "args": {
        "1": "enm",
        "2": "-acioun"
      },
      "expansion": "Doublet of -acioun",
      "name": "doublet"
    }
  ],
  "etymology_text": "Borrowed from Old French -ison, from Latin -ātiōnem. Doublet of -acioun.",
  "head_templates": [
    {
      "args": {
        "1": "enm",
        "2": "suffix"
      },
      "expansion": "-isoun",
      "name": "head"
    }
  ],
  "lang": "Middle English",
  "lang_code": "enm",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Middle English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Forms nouns from French or Latin roots; -ation."
      ],
      "id": "en--isoun-enm-suffix-nHPoN5C1",
      "links": [
        [
          "-ation",
          "-ation#English"
        ]
      ],
      "raw_glosses": [
        "(not productive) Forms nouns from French or Latin roots; -ation."
      ],
      "synonyms": [
        {
          "word": "-eison"
        },
        {
          "word": "-esoun"
        },
        {
          "word": "-esown"
        },
        {
          "word": "-ison"
        },
        {
          "word": "-isowne"
        },
        {
          "word": "-son"
        },
        {
          "word": "-soun"
        },
        {
          "word": "-yson"
        },
        {
          "word": "-ysone"
        },
        {
          "word": "-ysoun"
        },
        {
          "word": "-ysowne"
        },
        {
          "word": "-ysun"
        }
      ],
      "tags": [
        "idiomatic",
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-iˈzuːn/"
    },
    {
      "ipa": "/-izun/"
    }
  ],
  "word": "-isoun"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "enm",
        "2": "fro",
        "3": "-ison"
      },
      "expansion": "Borrowed from Old French -ison",
      "name": "bor+"
    },
    {
      "args": {
        "1": "enm",
        "2": "la",
        "3": "-ātiō",
        "4": "-ātiōnem"
      },
      "expansion": "Latin -ātiōnem",
      "name": "der"
    },
    {
      "args": {
        "1": "enm",
        "2": "-acioun"
      },
      "expansion": "Doublet of -acioun",
      "name": "doublet"
    }
  ],
  "etymology_text": "Borrowed from Old French -ison, from Latin -ātiōnem. Doublet of -acioun.",
  "head_templates": [
    {
      "args": {
        "1": "enm",
        "2": "suffix"
      },
      "expansion": "-isoun",
      "name": "head"
    }
  ],
  "lang": "Middle English",
  "lang_code": "enm",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Middle English doublets",
        "Middle English entries with incorrect language header",
        "Middle English lemmas",
        "Middle English noun-forming suffixes",
        "Middle English suffixes",
        "Middle English terms borrowed from Old French",
        "Middle English terms derived from Latin",
        "Middle English terms derived from Old French",
        "Middle English terms with non-redundant non-automated sortkeys",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Forms nouns from French or Latin roots; -ation."
      ],
      "links": [
        [
          "-ation",
          "-ation#English"
        ]
      ],
      "raw_glosses": [
        "(not productive) Forms nouns from French or Latin roots; -ation."
      ],
      "tags": [
        "idiomatic",
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-iˈzuːn/"
    },
    {
      "ipa": "/-izun/"
    }
  ],
  "synonyms": [
    {
      "word": "-eison"
    },
    {
      "word": "-esoun"
    },
    {
      "word": "-esown"
    },
    {
      "word": "-ison"
    },
    {
      "word": "-isowne"
    },
    {
      "word": "-son"
    },
    {
      "word": "-soun"
    },
    {
      "word": "-yson"
    },
    {
      "word": "-ysone"
    },
    {
      "word": "-ysoun"
    },
    {
      "word": "-ysowne"
    },
    {
      "word": "-ysun"
    }
  ],
  "word": "-isoun"
}