Etymology

zip code

Today it means: A postal code, especially for addresses served by the US Postal Service, consisting of a five- or nine-figure number. Full definition →

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zip code · noun, verb1

From ZIP Code, a trademark of the United States Postal Service, from ZIP (“Zone Improvement Plan”), introduced 1963.

ZIP Code · noun2

Trademark of United States Postal Service, from ZIP (“Zone Improvement Plan”), introduced 1963.

Etymology from Wiktionary, CC BY-SA 4.0.