"a" meaning in Dalmatian

{
  "categories": [
    {
      "_dis": "0 0",
      "kind": "other",
      "name": "Dalmatian entries with incorrect language header",
      "parents": [
        "Entries with incorrect language header",
        "Entry maintenance"
      ],
      "source": "w+disamb"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "dlm",
        "2": "la",
        "3": "ad"
      },
      "expansion": "Latin ad",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin ad.",
  "head_templates": [
    {
      "args": {
        "1": "dlm",
        "2": "prepositions"
      },
      "expansion": "a",
      "name": "head"
    }
  ],
  "lang": "Dalmatian",
  "lang_code": "dlm",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Dalmatian prepositions",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "to"
      ],
      "id": "en-a-dlm-prep-Zj6hv~~l",
      "links": [
        [
          "to",
          "to"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Dalmatian prepositions",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "at"
      ],
      "id": "en-a-dlm-prep-sda5G2fC",
      "links": [
        [
          "at",
          "at"
        ]
      ]
    }
  ],
  "word": "a"
}

{
  "categories": [
    "Dalmatian entries with incorrect language header",
    "Dalmatian lemmas",
    "Dalmatian prepositions",
    "Dalmatian terms derived from Latin",
    "Dalmatian terms inherited from Latin"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "dlm",
        "2": "la",
        "3": "ad"
      },
      "expansion": "Latin ad",
      "name": "inh"
    }
  ],
  "etymology_text": "From Latin ad.",
  "head_templates": [
    {
      "args": {
        "1": "dlm",
        "2": "prepositions"
      },
      "expansion": "a",
      "name": "head"
    }
  ],
  "lang": "Dalmatian",
  "lang_code": "dlm",
  "pos": "prep",
  "senses": [
    {
      "glosses": [
        "to"
      ],
      "links": [
        [
          "to",
          "to"
        ]
      ]
    },
    {
      "glosses": [
        "at"
      ],
      "links": [
        [
          "at",
          "at"
        ]
      ]
    }
  ],
  "word": "a"
}