Breadcrumb Home > Dictionary Cite Meaning of noise factor Find definitions for: noise' fac"tor Pronunciation: [key] — Radio, Electronics. Radio,Electronics. the ratio of the noise output of an ideal device to the noise output of the unit being tested. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. noise noiseless Related Content Daily Word Quiz: erpsichore Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language