/ Dictionary / Index C checkup: Meaning and Definition of Find definitions for: check•up Pronunciation: (chek'up"), [key] — n. a comprehensive physical examination: He went to the doctor for a checkup. an examination or close scrutiny, as for verification, accuracy, or comparison: They gave the motor a checkup. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: checkup (Thesaurus) checks and balances check valve Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language