/ Dictionary / Index T twelvemo: Meaning and Definition of Find definitions for: twelve•mo Pronunciation: (twelv'mō), [key] — pl. adj. -mos, duodecimo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. twelve-mile limit twelvemonth Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language