initial code


See under zip code.

Nearby words

  1. iniquitous,
  2. iniquitously,
  3. iniquity,
  4. init.,
  5. initial,
  6. initial rhyme,
  7. initial teaching alphabet,
  8. initialism,
  9. initialize,
  10. initially

zip code

or 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 Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for initial code

zip code


the US equivalent of postcode

Word Origin for zip code

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