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Zip Code (zip code [or] ZIP code)

 
pronunciation:
zIp kod
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part of speech: noun
definition: When we talk about a "zip code," we mean the set of five or more numbers that come at the end of an address in mail. Every area in the United States has a different set of numbers for their zip code. You write the numbers after the state name in an address. Actually, "ZIP code" is a system used by the United States postal service, which decides the code for each small area of the country and uses it to make the mail service work well.
I knew my grandparents' street address, but I had to ask my mom for their zip code.
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