/ Dictionary / Index S seatmate: Meaning and Definition of Find definitions for: seat•mate Pronunciation: (sēt'māt"), [key] — n. a person who shares a seat or occupies the seat next to oneself on a bus, plane, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. seating SEATO Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language