Pronunciation: (moun'tn),[key] —n. 1. a natural elevation of the earth's surface rising more or less abruptly to a summit, and attaining an altitude greater than that of a hill, usually greater than 2000 ft. (610 m).
2. a large mass of something resembling this, as in shape or size.
3. a huge amount: a mountain of incoming mail. 4. (cap.) a steam locomotive having a four-wheeled front truck, eight driving wheels, and a two-wheeled rear truck. See table under Whyte classification. 5. Also calledmoun'tain wine".Brit. Archaic.a sweet Malaga wine.
6. make a mountain out of a molehill. See molehill (def. 2).
—adj. 1. of or pertaining to mountains: mountain air. 2. living, growing, or located in the mountains: mountain people. 3. resembling or suggesting a mountain, as in size.