/ Dictionary / Index H hypothesize: Meaning and Definition of Find definitions for: hy•poth•e•size Pronunciation: (hī-poth'u-sīz", hi-), [key] — v., -sized, -siz•ing. —v.i. to form a hypothesis. —v.t. to assume by hypothesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypothesize (Thesaurus) hypothesis hypothetical Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language