/ Dictionary / Index O OR circuit: Meaning and Definition of Find definitions for: OR' cir"cuit Pronunciation: (ôr), [key] — Computers. Computers. a circuit that is energized when any of its inputs are energized. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orcinol Orcus Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language