"oca" meaning in Middle Irish

{
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "prepositional pronoun"
      },
      "expansion": "oca",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "pron",
  "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 prepositional pronouns",
          "parents": [
            "Prepositional pronouns",
            "Prepositions",
            "Pronoun forms",
            "Lemmas",
            "Non-lemma forms",
            "Pronouns"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "oc"
        }
      ],
      "glosses": [
        "third-person singular masculine dative of oc"
      ],
      "id": "en-oca-mga-pron-K0uFLRcr",
      "links": [
        [
          "oc",
          "oc#Middle Irish"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "masculine",
        "singular",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈoɡə/"
    }
  ],
  "word": "oca"
}

{
  "categories": [
    "es:Geese",
    "es:Oxalidales order plants",
    "es:Vegetables"
  ],
  "head_templates": [
    {
      "args": {
        "1": "mga",
        "2": "prepositional pronoun"
      },
      "expansion": "oca",
      "name": "head"
    }
  ],
  "lang": "Middle Irish",
  "lang_code": "mga",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Middle Irish entries with incorrect language header",
        "Middle Irish non-lemma forms",
        "Middle Irish prepositional pronouns",
        "Middle Irish terms with IPA pronunciation"
      ],
      "form_of": [
        {
          "word": "oc"
        }
      ],
      "glosses": [
        "third-person singular masculine dative of oc"
      ],
      "links": [
        [
          "oc",
          "oc#Middle Irish"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "masculine",
        "singular",
        "third-person"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈoɡə/"
    }
  ],
  "word": "oca"
}