noun U.S. Army.
a retail store on an army installation that sells goods and services to military personnel and their dependents and to certain authorized civilian personnel. Abbreviation: PX
Origin of post exchange
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for post exchange
US a government-subsidized shop operated mainly for military personnelAbbreviation: PX
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