/ Dictionary / Index N non compos: Meaning and Definition of Find definitions for: non com•pos Pronunciation: (non' kom'pus), [key] — Informal. Informal. Seenon compos mentis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. noncompliance non compos mentis* Related Content Daily Word Quiz: tranquil Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language