"A2C" meaning in English

{
  "forms": [
    {
      "form": "A2Cs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "A2C (plural A2Cs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Military ranks",
          "orig": "en:Military ranks",
          "parents": [
            "Military",
            "Positions of authority",
            "Titles",
            "Society",
            "Leaders",
            "Occupations",
            "People",
            "All topics",
            "Work",
            "Human",
            "Fundamental",
            "Human activity",
            "Human behaviour"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012, The Code Of Federal Regulations Of The United States Of America",
          "text": "Authorized grade of A2C (E-3).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Airman second class"
      ],
      "id": "en-A2C-en-noun-7VQB7fVd",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Airman second class",
          "airman second class"
        ]
      ],
      "raw_glosses": [
        "(military) Airman second class"
      ],
      "synonyms": [
        {
          "word": "A2/c"
        },
        {
          "word": "A2/C"
        }
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    }
  ],
  "word": "A2C"
}

{
  "forms": [
    {
      "form": "A2Cs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "A2C (plural A2Cs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms spelled with numbers",
        "English terms with quotations",
        "en:Military ranks"
      ],
      "examples": [
        {
          "ref": "2012, The Code Of Federal Regulations Of The United States Of America",
          "text": "Authorized grade of A2C (E-3).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Airman second class"
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "Airman second class",
          "airman second class"
        ]
      ],
      "raw_glosses": [
        "(military) Airman second class"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "A2/c"
    },
    {
      "word": "A2/C"
    }
  ],
  "word": "A2C"
}