/ Dictionary / Index M mayn't: Meaning and Definition of Find definitions for: may•n't Pronunciation: (mā'unt, mānt), [key] contraction of may not. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Maynard mayo Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language