/ Dictionary / Index T twain: Meaning and Definition of Find definitions for: twain Pronunciation: (twān), [key] — adj., n. two. Twain Pronunciation: (twān), [key] — n. pen name of Samuel Langhorne Clemens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: twain (Thesaurus) twaddle twang Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language