/ Dictionary / Index C conversion ratio: Meaning and Definition of Find definitions for: conver'sion ra"tio Pronunciation: [key] — Physics. Physics. (in a reactor) the number of fissionable atoms produced by each fissionable atom that is destroyed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. conversion disorder conversion table Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language