"ZIP Code" meaning in English

{
  "etymology_text": "Trademark of United States Postal Service, from ZIP (“Zone Improvement Plan”), introduced 1963.",
  "forms": [
    {
      "form": "ZIP Codes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "ZIP Code"
      },
      "expansion": "ZIP Code (plural ZIP Codes)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Post",
          "orig": "en:Post",
          "parents": [
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "zip code"
        }
      ],
      "glosses": [
        "Uncommon form of zip code."
      ],
      "id": "en-ZIP_Code-en-noun-Yk1iBGQn",
      "links": [
        [
          "zip code",
          "zip code#English"
        ]
      ],
      "tags": [
        "form-of",
        "uncommon"
      ],
      "wikipedia": [
        "ZIP Code",
        "Zone Improvement Plan"
      ]
    }
  ],
  "word": "ZIP Code"
}

{
  "etymology_text": "Trademark of United States Postal Service, from ZIP (“Zone Improvement Plan”), introduced 1963.",
  "forms": [
    {
      "form": "ZIP Codes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "ZIP Code"
      },
      "expansion": "ZIP Code (plural ZIP Codes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncommon forms",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Post"
      ],
      "form_of": [
        {
          "word": "zip code"
        }
      ],
      "glosses": [
        "Uncommon form of zip code."
      ],
      "links": [
        [
          "zip code",
          "zip code#English"
        ]
      ],
      "tags": [
        "form-of",
        "uncommon"
      ],
      "wikipedia": [
        "ZIP Code",
        "Zone Improvement Plan"
      ]
    }
  ],
  "word": "ZIP Code"
}