/ Dictionary / Index S sizeable: Meaning and Definition of Find definitions for: size•a•ble Pronunciation: (sī'zu-bul), [key] — adj. sizable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sizeable (Thesaurus) size sized Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language