/ Dictionary / Index E em quad: Meaning and Definition of Find definitions for: em' quad" Pronunciation: [key] a square unit of area, one em on each side. a quad having such an area. Cf. quad (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. empyrean EMS Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language