"AA-C" meaning in English

{
  "forms": [
    {
      "form": "AA-Cs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "AA-C (countable and uncountable, plural AA-Cs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "anesthesiologist assistant certified"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of anesthesiologist assistant certified."
      ],
      "id": "en-AA-C-en-noun-bP9ZMjrX",
      "links": [
        [
          "anesthesiologist assistant certified",
          "anesthesiologist assistant certified#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "countable",
        "initialism",
        "uncountable"
      ]
    }
  ],
  "word": "AA-C"
}

{
  "forms": [
    {
      "form": "AA-Cs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "AA-C (countable and uncountable, plural AA-Cs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "anesthesiologist assistant certified"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English initialisms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "English three-letter abbreviations",
        "English uncountable nouns"
      ],
      "glosses": [
        "Initialism of anesthesiologist assistant certified."
      ],
      "links": [
        [
          "anesthesiologist assistant certified",
          "anesthesiologist assistant certified#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "countable",
        "initialism",
        "uncountable"
      ]
    }
  ],
  "word": "AA-C"
}