/ Dictionary / Index G Great Plains: Meaning and Definition of Find definitions for: Great' Plains' Pronunciation: [key] a semiarid region E of the Rocky Mountains, in the U.S. and Canada. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Great Plague Great Power Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language