<p><strong>Noun</strong></p><ul><li>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 2,000 feet (610 meters).</li><li>a large mass of something resembling this, as in shape or size.</li><li>a huge amount: a mountain of incoming mail.</li><li>(initial capital letter) a steam locomotive having a four-wheeled front truck, eight driving wheels, and a two-wheeled rear truck.</li><li>Also called mountain wine.</li><li>British Archaic: a sweet Malaga wine.</li></ul><p><strong>Adjective</strong></p><ul><li>of or relating to mountains: mountain air.</li><li>living, growing, or located in the mountains: mountain people.</li><li>resembling or suggesting a mountain, as in size.</li></ul>