/ Dictionary / Index A Altai Mountains: Meaning and Definition of Find definitions for: Al'tai Moun'tains Pronunciation: [key] a mountain range in central Asia, mostly in Mongolia, China, Kazakhstan, and the S Russian Federation. Highest peak, Belukha, 15,157 ft. (4506 m). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Altaic Altair Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language