/ Dictionary / Index C caps.: Meaning and Definition of Find definitions for: caps. Pronunciation: [key] capital letters. (in prescriptions) a capsule. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: caps (Thesaurus) caprylic acid capsaicin Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language