/ Dictionary / Index O operational amplifier: Meaning and Definition of Find definitions for: opera'tional am'plifier Pronunciation: [key] — Electronics. Electronics. a high-gain, high-input impedance amplifier, usually an integrated circuit, that can perform mathematical operations when suitably wired. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. operational operational calculus Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language