/ Dictionary / Index P presumably: Meaning and Definition of Find definitions for: pre•sum•a•bly Pronunciation: (pri-z'mu-blē), [key] — adv. by assuming reasonably; probably: Since he is a consistent winner, he is presumably a superior player. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: presumably (Thesaurus) presumable presume Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language