Definition of PX noun from the Oxford Advanced American Dictionary

 

PX

 noun
noun
NAmE//ˌpi ˈɛks//
 
(pl. PXs
NAmE//ˌpi ˈɛksəz//
 
)
 
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post exchange(a store at a military base that sells food, clothes, and other things)
See the Oxford Advanced Learner's Dictionary entry: PX