/ Dictionary / Index S Seine-et-Oise: Meaning and Definition of Find definitions for: Seine-et-Oise Pronunciation: (sen-ā-waz'), [key] — n. a former department in N France. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seine-et-Marne Seine-Maritime 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