"seissed" meaning in Middle Irish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "seiseadh"
          },
          "expansion": "Irish: seiseadh",
          "name": "desc"
        }
      ],
      "text": "Irish: seiseadh"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gd",
            "2": "seiseadh"
          },
          "expansion": "Scottish Gaelic: seiseadh",
          "name": "desc"
        }
      ],
      "text": "Scottish Gaelic: seiseadh"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "mga",
        "2": "sga",
        "3": "seissed"
      },
      "expansion": "Old Irish seissed",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Irish seissed.",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "seissed",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "ṡeissed",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "adjective",
        "cat2": "ordinal numbers"
      },
      "expansion": "seissed",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Middle Irish links with redundant target parameters",
          "parents": [
            "Links with redundant target parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Middle Irish ordinal numbers",
          "parents": [
            "Ordinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "That is one of the six halls that were in Ireland at that time […]",
          "ref": "c. 1000, “The Tale of Mac Da Thó's Pig”, in Ernst Windisch, editor, Irische Texte, volume 1, published 1800, section 1:",
          "text": "Is í sein int ṡeised bruiden ro·boi i n‑hErind in tan sin […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "sixth"
      ],
      "id": "en-seissed-mga-adj-7~qmjSjf",
      "links": [
        [
          "sixth",
          "sixth"
        ]
      ],
      "synonyms": [
        {
          "word": "seised"
        },
        {
          "word": "sesed"
        },
        {
          "word": "sessed"
        }
      ]
    }
  ],
  "word": "seissed"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "ga",
            "2": "seiseadh"
          },
          "expansion": "Irish: seiseadh",
          "name": "desc"
        }
      ],
      "text": "Irish: seiseadh"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "gd",
            "2": "seiseadh"
          },
          "expansion": "Scottish Gaelic: seiseadh",
          "name": "desc"
        }
      ],
      "text": "Scottish Gaelic: seiseadh"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "mga",
        "2": "sga",
        "3": "seissed"
      },
      "expansion": "Old Irish seissed",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Irish seissed.",
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "seissed",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    },
    {
      "form": "ṡeissed",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "adjective",
        "cat2": "ordinal numbers"
      },
      "expansion": "seissed",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Middle Irish adjectives",
        "Middle Irish entries with incorrect language header",
        "Middle Irish lemmas",
        "Middle Irish links with redundant target parameters",
        "Middle Irish ordinal numbers",
        "Middle Irish terms derived from Old Irish",
        "Middle Irish terms inherited from Old Irish",
        "Middle Irish terms with quotations",
        "Pages with 2 entries",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "That is one of the six halls that were in Ireland at that time […]",
          "ref": "c. 1000, “The Tale of Mac Da Thó's Pig”, in Ernst Windisch, editor, Irische Texte, volume 1, published 1800, section 1:",
          "text": "Is í sein int ṡeised bruiden ro·boi i n‑hErind in tan sin […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "sixth"
      ],
      "links": [
        [
          "sixth",
          "sixth"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "seised"
    },
    {
      "word": "sesed"
    },
    {
      "word": "sessed"
    }
  ],
  "word": "seissed"
}

{
  "called_from": "inflection/865",
  "msg": "inflection table: IF WITHOUT ELSE EVALS False: seissed/Middle Irish 'radical' base_tags=set()",
  "path": [
    "seissed"
  ],
  "section": "Middle Irish",
  "subsection": "adjective",
  "title": "seissed",
  "trace": ""
}

{
  "called_from": "inflection/735",
  "msg": "inflection table: unrecognized header: 'lenition'",
  "path": [
    "seissed"
  ],
  "section": "Middle Irish",
  "subsection": "adjective",
  "title": "seissed",
  "trace": ""
}

{
  "called_from": "inflection/735",
  "msg": "inflection table: unrecognized header: 'nasalization'",
  "path": [
    "seissed"
  ],
  "section": "Middle Irish",
  "subsection": "adjective",
  "title": "seissed",
  "trace": ""
}