/ Dictionary / Index O on-seam: Meaning and Definition of Find definitions for: on-seam Pronunciation: (on'sēm", ôn'-), [key] — adj. inseam (def. 3.). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. on-screen on-season Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language