"AmEx" meaning in English

{
  "etymology_text": "From the initial syllable of each word.",
  "head_templates": [
    {
      "args": {},
      "expansion": "AmEx",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "American Express"
        }
      ],
      "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 links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of American Express."
      ],
      "id": "en-AmEx-en-name-niyfyAw~",
      "links": [
        [
          "American Express",
          "w:American Express"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "AmEx"
}

{
  "etymology_text": "From the initial syllable of each word.",
  "head_templates": [
    {
      "args": {},
      "expansion": "AmEx",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "American Express"
        }
      ],
      "categories": [
        "English abbreviations",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English links with redundant alt parameters",
        "English links with redundant wikilinks",
        "English proper nouns",
        "English syllabic abbreviations",
        "English uncountable nouns"
      ],
      "glosses": [
        "Abbreviation of American Express."
      ],
      "links": [
        [
          "American Express",
          "w:American Express"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "AmEx"
}