/ Dictionary / Index I inverse cosine: Meaning and Definition of Find definitions for: in'verse co'sine Pronunciation: [key] — Trig. Trig. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. inverse cosecant inverse cotangent Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language