/ Dictionary / Index A antimensium: Meaning and Definition of Find definitions for: an•ti•men•si•um Pronunciation: (an"ti-men'sē-um), [key] — pl. -si•a antimension. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. antimension antimere Related Content Daily Word Quiz: pauper Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language