Definitions for PX
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Random House Webster's College Dictionary
PX(pl.)PXs.
post exchange.
Category: Military
Princeton's WordNet
post exchange, PX(noun)
a commissary on a United States Army post
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"PX." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/PX>.