"-acha" meaning in Irish

{
  "etymology_templates": [
    {
      "args": {
        "1": "ga",
        "2": "sga",
        "3": "-"
      },
      "expansion": "Old Irish",
      "name": "inh"
    },
    {
      "args": {
        "1": "sga",
        "2": "cathair"
      },
      "expansion": "Old Irish cathair",
      "name": "noncog"
    },
    {
      "args": {
        "1": "ga",
        "2": "cathair"
      },
      "expansion": "Irish cathair",
      "name": "noncog"
    }
  ],
  "etymology_text": "Originally the Old Irish accusative and vocative plural ending of k-stem nouns. For example Old Irish cathair/cathir, vocative/accusative plural cathracha → Irish cathair, plural cathracha.",
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "suffix",
        "cat2": "inflectional suffixes",
        "cat3": "",
        "g": "",
        "g2": ""
      },
      "expansion": "-acha",
      "name": "head"
    },
    {
      "args": {
        "1": "i"
      },
      "expansion": "-acha",
      "name": "ga-suffix"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Irish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Ending of the plural of certain nouns."
      ],
      "id": "en--acha-ga-suffix-OW39ChKZ",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-acha"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ga",
        "2": "sga",
        "3": "-"
      },
      "expansion": "Old Irish",
      "name": "inh"
    },
    {
      "args": {
        "1": "sga",
        "2": "cathair"
      },
      "expansion": "Old Irish cathair",
      "name": "noncog"
    },
    {
      "args": {
        "1": "ga",
        "2": "cathair"
      },
      "expansion": "Irish cathair",
      "name": "noncog"
    }
  ],
  "etymology_text": "Originally the Old Irish accusative and vocative plural ending of k-stem nouns. For example Old Irish cathair/cathir, vocative/accusative plural cathracha → Irish cathair, plural cathracha.",
  "head_templates": [
    {
      "args": {
        "1": "ga",
        "2": "suffix",
        "cat2": "inflectional suffixes",
        "cat3": "",
        "g": "",
        "g2": ""
      },
      "expansion": "-acha",
      "name": "head"
    },
    {
      "args": {
        "1": "i"
      },
      "expansion": "-acha",
      "name": "ga-suffix"
    }
  ],
  "lang": "Irish",
  "lang_code": "ga",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Irish entries with incorrect language header",
        "Irish inflectional suffixes",
        "Irish lemmas",
        "Irish suffixes",
        "Irish terms derived from Old Irish",
        "Irish terms inherited from Old Irish",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Ending of the plural of certain nouns."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-acha"
}