/ Dictionary / Index A Assiniboine: Meaning and Definition of Find definitions for: As•sin•i•boine Pronunciation: (u-sin'u-boin"), [key] — n. a river in S Canada, flowing S and E from SE Saskatchewan into the Red River in S Manitoba. 450 mi. (725 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Assiniboin Assisi Related Content Daily Word Quiz: sylvan Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language