"a-" meaning in Náhuatl de la Huasteca central

{
  "categories": [
    {
      "kind": "other",
      "name": "NCH:Palabras de etimología sin precisar",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "NCH:Prefijos",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "NCH:Rimas:a",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Náhuatl de la Huasteca central",
      "parents": [],
      "source": "w"
    }
  ],
  "hyphenation": "a-",
  "lang": "Náhuatl de la Huasteca central",
  "lang_code": "nch",
  "pos": "prefix",
  "pos_title": "Prefijo",
  "senses": [
    {
      "glosses": [
        "Agua. Prefijo que denota agua."
      ],
      "id": "es-a--nch-prefix-gqM3gyjq",
      "sense_index": "1"
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈa/"
    },
    {
      "rhymes": "a"
    }
  ],
  "word": "a-"
}

{
  "categories": [
    "NCH:Palabras de etimología sin precisar",
    "NCH:Prefijos",
    "NCH:Rimas:a",
    "Náhuatl de la Huasteca central"
  ],
  "hyphenation": "a-",
  "lang": "Náhuatl de la Huasteca central",
  "lang_code": "nch",
  "pos": "prefix",
  "pos_title": "Prefijo",
  "senses": [
    {
      "glosses": [
        "Agua. Prefijo que denota agua."
      ],
      "sense_index": "1"
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈa/"
    },
    {
      "rhymes": "a"
    }
  ],
  "word": "a-"
}