"os" meaning in Old Irish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "mga",
            "2": "os"
          },
          "expansion": "Middle Irish: os",
          "name": "desc"
        }
      ],
      "text": "Middle Irish: os"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "cel-pro",
        "3": "*sonts"
      },
      "expansion": "Proto-Celtic *sonts",
      "name": "inh"
    },
    {
      "args": {
        "1": "cel-pro",
        "2": "*sontes"
      },
      "expansion": "*sontes",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ot"
      },
      "expansion": "ot",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ine-pro",
        "3": "*h₁sónts"
      },
      "expansion": "Proto-Indo-European *h₁sónts",
      "name": "inh"
    },
    {
      "args": {
        "1": "sga",
        "2": "is"
      },
      "expansion": "is",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ocus",
        "t": "and"
      },
      "expansion": "ocus (“and”)",
      "name": "m"
    }
  ],
  "etymology_text": "Hamp derives this from Proto-Celtic *sonts, plural *sontes (whence ot); ultimately from Proto-Indo-European *h₁sónts. Copular origin explains the use of independent subject pronouns with this conjunction, which otherwise are usually used with the copula is.\nA more traditional theory, assumed by Pedersen and Thurneysen among others, supposes that this is a contraction of ocus (“and”), with the apparent copular behaviour being analogical.",
  "forms": [
    {
      "form": "ot",
      "tags": [
        "plural",
        "third-person"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "conjunction",
        "3": "third-person plural",
        "4": "ot"
      },
      "expansion": "os (third-person plural ot)",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "conj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with ISSN errors",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "disjunctive conjunction"
      ],
      "id": "en-os-sga-conj-B~S8mlnt",
      "synonyms": [
        {
          "word": "as"
        },
        {
          "word": "es"
        },
        {
          "alt": "aberrant Würzburg forms",
          "word": "is"
        }
      ]
    }
  ],
  "word": "os"
}

{
  "categories": [
    "White Hmong entries with incorrect language header",
    "White Hmong interjections",
    "White Hmong lemmas",
    "White Hmong terms with IPA pronunciation"
  ],
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "mga",
            "2": "os"
          },
          "expansion": "Middle Irish: os",
          "name": "desc"
        }
      ],
      "text": "Middle Irish: os"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "cel-pro",
        "3": "*sonts"
      },
      "expansion": "Proto-Celtic *sonts",
      "name": "inh"
    },
    {
      "args": {
        "1": "cel-pro",
        "2": "*sontes"
      },
      "expansion": "*sontes",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ot"
      },
      "expansion": "ot",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ine-pro",
        "3": "*h₁sónts"
      },
      "expansion": "Proto-Indo-European *h₁sónts",
      "name": "inh"
    },
    {
      "args": {
        "1": "sga",
        "2": "is"
      },
      "expansion": "is",
      "name": "m"
    },
    {
      "args": {
        "1": "sga",
        "2": "ocus",
        "t": "and"
      },
      "expansion": "ocus (“and”)",
      "name": "m"
    }
  ],
  "etymology_text": "Hamp derives this from Proto-Celtic *sonts, plural *sontes (whence ot); ultimately from Proto-Indo-European *h₁sónts. Copular origin explains the use of independent subject pronouns with this conjunction, which otherwise are usually used with the copula is.\nA more traditional theory, assumed by Pedersen and Thurneysen among others, supposes that this is a contraction of ocus (“and”), with the apparent copular behaviour being analogical.",
  "forms": [
    {
      "form": "ot",
      "tags": [
        "plural",
        "third-person"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "conjunction",
        "3": "third-person plural",
        "4": "ot"
      },
      "expansion": "os (third-person plural ot)",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "conj",
  "senses": [
    {
      "categories": [
        "Old Irish conjunctions",
        "Old Irish entries with incorrect language header",
        "Old Irish lemmas",
        "Old Irish terms derived from Proto-Celtic",
        "Old Irish terms derived from Proto-Indo-European",
        "Old Irish terms inherited from Proto-Celtic",
        "Old Irish terms inherited from Proto-Indo-European",
        "Pages with ISSN errors"
      ],
      "glosses": [
        "disjunctive conjunction"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "as"
    },
    {
      "word": "es"
    },
    {
      "alt": "aberrant Würzburg forms",
      "word": "is"
    }
  ],
  "word": "os"
}