/ Dictionary / Index Q QED: Meaning and Definition of Find definitions for: QED Pronunciation: [key] — Physics. Physics. See Q.E.D. Pronunciation: [key] which was to be shown or demonstrated (used esp. in mathematical proofs). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: qed (Thesaurus) q.e. Q.E.F. Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language