/ Dictionary / Index M multiple fission: Meaning and Definition of Find definitions for: mul'tiple fis'sion Pronunciation: [key] fission into more than two new organisms. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. multiple factors multiple independently targetable reentry vehicle Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language