/ Dictionary / Index S set-in: Meaning and Definition of Find definitions for: set-in Pronunciation: (set'in"), [key] — adj. made separately and placed within another unit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: set-in (Thesaurus) setigerous set-in sleeve Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language