/ Dictionary / Index C CPU: Meaning and Definition of Find definitions for: CPU Pronunciation: [key] — Computers. Computers. central processing unit: the key component of a computer system, which contains the circuitry necessary to interpret and execute program instructions. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cpu (Thesaurus) CPT theorem CQ 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