initial code

noun
See under zip code.
Dictionary.com Unabridged

zip code

noun
a system used in the U.S. to facilitate the delivery of mail, consisting of a five- or nine-digit code printed directly after the address, the first five digits (initial code) indicating the state and post office or postal zone, the last four (expanded code) the box section or number, portion of a rural route, building, or other specific delivery location.
Also, ZIP code, Zip code.


Origin:
1960–65, Americanism; Z(one) I(mprovement) P(rogram)

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
zip code
 
n
the US equivalent of postcode
 
[C20: from z(one) i(mprovement) p(lan)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The majority of the meeting was spent reviewing the initial code change draft that was begun two meetings ago.
The environment must be ready for the initial code migration two to four weeks prior to execution.
The initial code was copyrighted and the new version will be copyrighted this year.
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