"a·-" meaning in Garo

{
  "head_templates": [
    {
      "args": {
        "1": "grt",
        "2": "prefix"
      },
      "expansion": "a·-",
      "name": "head"
    }
  ],
  "lang": "Garo",
  "lang_code": "grt",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Garo entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "a·a"
        },
        {
          "word": "a·bri"
        },
        {
          "word": "A·chik"
        },
        {
          "word": "A·chikku"
        },
        {
          "word": "a·gilsak"
        },
        {
          "word": "a·sam"
        },
        {
          "word": "a·song"
        }
      ],
      "glosses": [
        "land, soil, countryside"
      ],
      "id": "en-a·--grt-prefix-7Nz9AveR",
      "qualifier": "categorizing prefix",
      "raw_glosses": [
        "(categorizing prefix) land, soil, countryside"
      ],
      "related": [
        {
          "word": "ha·-"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "a·-"
}

{
  "derived": [
    {
      "word": "a·a"
    },
    {
      "word": "a·bri"
    },
    {
      "word": "A·chik"
    },
    {
      "word": "A·chikku"
    },
    {
      "word": "a·gilsak"
    },
    {
      "word": "a·sam"
    },
    {
      "word": "a·song"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "grt",
        "2": "prefix"
      },
      "expansion": "a·-",
      "name": "head"
    }
  ],
  "lang": "Garo",
  "lang_code": "grt",
  "pos": "prefix",
  "related": [
    {
      "word": "ha·-"
    }
  ],
  "senses": [
    {
      "categories": [
        "Garo entries with incorrect language header",
        "Garo lemmas",
        "Garo prefixes",
        "Pages with 1 entry"
      ],
      "glosses": [
        "land, soil, countryside"
      ],
      "qualifier": "categorizing prefix",
      "raw_glosses": [
        "(categorizing prefix) land, soil, countryside"
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "a·-"
}