/ Dictionary / Index M mensa: Meaning and Definition of Find definitions for: men•sa Pronunciation: (men'su), [key] — pl. gen. -sas, -sae -sae Also calledthe flat stone forming the top of the altar in a Roman Catholic church. (cap.)the Table, a southern constellation near Octans. Men•sa Pronunciation: (men'su), [key] — n. an international fellowship organization for people with IQ's in the top 2 percent of the general population. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mensa (Thesaurus) men's mensal 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