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ZIP + 4

[ zip-pluhs fawr, fohr ]
/ ˈzɪp ˌplʌs ˈfɔr, ˈfoʊr /
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noun
a zip code of nine digits, used to facilitate accurate and prompt delivery of mail.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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