/ Dictionary / Index M many-one: Meaning and Definition of Find definitions for: man•y-one Pronunciation: (men'ē-wun' usually read as men'ē-t&schwa-wun'), [key] — adj. Logic, Math. (of a relation) having the property that each element is assigned to one element only but that many elements may be assigned to the same element. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. manyfold many-sided Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language