What do a.m. and p.m. stand for?

initial code

See under zip code.

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.
Origin of zip code
1960-65, Americanism; Z(one) I(mprovement) P(rogram) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for initial code
  • 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.
British Dictionary definitions for initial code

zip code

the US equivalent of postcode
Word Origin
C20: from z(one) i(mprovement) p(lan)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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