Breadcrumb Home > Dictionary > Index O operating income: Meaning and Definition of Find definitions for: op'erating in"come Pronunciation: [key] revenue from business operations after operating expenses are deducted from gross income. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. operating operating room ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language