"-a" meaning in Old Irish

{
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "relative"
      },
      "expansion": "",
      "name": "etymid"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "relative pronoun"
      },
      "expansion": "-a",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish relative pronouns",
          "parents": [
            "Relative pronouns",
            "Pronouns",
            "Relative pro-forms",
            "Lemmas",
            "Pro-forms",
            "Terms by semantic function"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "ar (“for the sake of”) + -a → ara (“for the sake of whom/which”)",
          "type": "example"
        }
      ],
      "glosses": [
        "combines with prepositions to form a relative pronoun"
      ],
      "id": "en--a-sga-pron-icBR0sMJ"
    }
  ],
  "sounds": [
    {
      "ipa": "[a]"
    }
  ],
  "word": "-a"
}

{
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "comparative"
      },
      "expansion": "",
      "name": "etymid"
    },
    {
      "args": {
        "1": "cel-pro",
        "2": "*-is"
      },
      "expansion": "Proto-Celtic *-is",
      "name": "m+"
    },
    {
      "args": {
        "1": "rebracketing"
      },
      "expansion": "rebracketing",
      "name": "glossary"
    },
    {
      "args": {
        "1": "cel-pro",
        "2": "*māros",
        "3": "*mais",
        "t": "more"
      },
      "expansion": "Proto-Celtic *mais (“more”)",
      "name": "m+"
    },
    {
      "args": {
        "1": "sga",
        "2": "mó"
      },
      "expansion": "Old Irish mó",
      "name": "m+"
    }
  ],
  "etymology_text": "An allomorph of -iu. It derives from Proto-Celtic *-is, the neuter of *-yūs. -is was extended to -ais thanks to a rebracketing of Proto-Celtic *mais (“more”) from *ma-is to *m-ais (neuter of *māyūs from which Old Irish mó).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "suffix",
        "cat2": "inflectional suffixes"
      },
      "expansion": "-a",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "_dis": "6 94",
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "lethan (“broad”) + -a → letha (“broader”)",
          "type": "example"
        }
      ],
      "glosses": [
        "forms the comparative degree of some adjectives"
      ],
      "id": "en--a-sga-suffix-9tEMHOoE",
      "synonyms": [
        {
          "word": "-iu"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[a]"
    }
  ],
  "word": "-a"
}

{
  "categories": [
    "Old Irish entries with incorrect language header",
    "Old Irish inflectional suffixes",
    "Old Irish lemmas",
    "Old Irish relative pronouns",
    "Old Irish suffixes",
    "Pages with 51 entries",
    "Pages with entries"
  ],
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "relative"
      },
      "expansion": "",
      "name": "etymid"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "relative pronoun"
      },
      "expansion": "-a",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "pron",
  "senses": [
    {
      "examples": [
        {
          "text": "ar (“for the sake of”) + -a → ara (“for the sake of whom/which”)",
          "type": "example"
        }
      ],
      "glosses": [
        "combines with prepositions to form a relative pronoun"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[a]"
    }
  ],
  "word": "-a"
}

{
  "categories": [
    "Old Irish entries with incorrect language header",
    "Old Irish inflectional suffixes",
    "Old Irish lemmas",
    "Old Irish suffixes",
    "Pages with 51 entries",
    "Pages with entries"
  ],
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "sga",
        "2": "comparative"
      },
      "expansion": "",
      "name": "etymid"
    },
    {
      "args": {
        "1": "cel-pro",
        "2": "*-is"
      },
      "expansion": "Proto-Celtic *-is",
      "name": "m+"
    },
    {
      "args": {
        "1": "rebracketing"
      },
      "expansion": "rebracketing",
      "name": "glossary"
    },
    {
      "args": {
        "1": "cel-pro",
        "2": "*māros",
        "3": "*mais",
        "t": "more"
      },
      "expansion": "Proto-Celtic *mais (“more”)",
      "name": "m+"
    },
    {
      "args": {
        "1": "sga",
        "2": "mó"
      },
      "expansion": "Old Irish mó",
      "name": "m+"
    }
  ],
  "etymology_text": "An allomorph of -iu. It derives from Proto-Celtic *-is, the neuter of *-yūs. -is was extended to -ais thanks to a rebracketing of Proto-Celtic *mais (“more”) from *ma-is to *m-ais (neuter of *māyūs from which Old Irish mó).",
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "suffix",
        "cat2": "inflectional suffixes"
      },
      "expansion": "-a",
      "name": "head"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "suffix",
  "senses": [
    {
      "examples": [
        {
          "text": "lethan (“broad”) + -a → letha (“broader”)",
          "type": "example"
        }
      ],
      "glosses": [
        "forms the comparative degree of some adjectives"
      ],
      "synonyms": [
        {
          "word": "-iu"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[a]"
    }
  ],
  "word": "-a"
}