/ Dictionary / Index C compos mentis*: Meaning and Definition of Find definitions for: com•pos men•tis Pronunciation: (kōm'pōs men'tis Eng. kom'p&schwas&sylpmen'tis), [key] sane; mentally sound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. compositor compossible Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language