/ Dictionary / Index S sizing: Meaning and Definition of Find definitions for: siz•ing Pronunciation: (sī'zing), [key] — n. the act or process of applying size or preparing with size. size, as for glazing paper or strengthening fabric. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sizing (Thesaurus) size-up sizy Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language