/ Dictionary / Index M Mount Rainier National Park: Meaning and Definition of Find definitions for: Mount' Rainier' Na'tional Park' Pronunciation: [key] a national park in W Washington, including Mount Rainier. 378 sq. mi. (980 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mount Rainier Mount Robson Park Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language