Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: zone improvement plan

zip code

 noun
     
Related topics: Mail
zip code [countable]
American EnglishTCM a number that you write at the end of an address on an envelope, package etc. The zip code shows the exact area where someone lives and helps the post office deliver the post more quickly [= postcode British English]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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