initial code

See under zip code. Unabridged

zip code

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.

1960–65, Americanism; Z(one) I(mprovement) P(rogram) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
zip code
the US equivalent of postcode
[C20: from z(one) i(mprovement) p(lan)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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