/ Dictionary / Index M multiple factors: Meaning and Definition of Find definitions for: mul'tiple fac'tors Pronunciation: [key] a series of two or more pairs of genes responsible for the development of complex, quantitative characters, as size or yield. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. multiple drill multiple fission Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language