/ Dictionary / Index P PX: Meaning and Definition of Find definitions for: PX Pronunciation: [key] — pl. PXs. See P.X. Pronunciation: [key] please exchange. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: px (Thesaurus) Pwyll pxt. Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language