/ Dictionary / Index C CPT theorem: Meaning and Definition of Find definitions for: CPT theorem Pronunciation: [key] the proposition that all the laws of physics are unchanged by the combined operations of charge conjugation (C), space inversion (P), and time reversal (T). Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cpt. CPU Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language