Definition of PX noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌpiː ˈeks//
; NAmE NAmE//ˌpiː ˈeks//
(pl. PXs
BrE BrE//ˌpiː ˈeksɪz//
; NAmE NAmE//ˌpiː ˈeksɪz//
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post exchange (a shop/store at a US military base that sells food, clothes and other things) Culture Prices are cheaper than in regular shops because there are no taxes and the PX does not make a profit. Such a shop on a US Air Force base is called a BX (Base Exchange) and on a US Navy base or ship it is called a NEX (Navy Exchange).
See the Oxford Advanced American Dictionary entry: PX