Definition of mountain

• n. - A large mass of earth and rock, rising above the common level of the earth or adjacent land; earth and rock forming an isolated peak or a ridge; an eminence higher than a hill; a mount.
• n. - A range, chain, or group of such elevations; as, the White Mountains.
• n. - A mountainlike mass; something of great bulk.
• a. - Of or pertaining to a mountain or mountains; growing or living on a mountain; found on or peculiar to mountains; among mountains; as, a mountain torrent; mountain pines; mountain goats; mountain air; mountain howitzer.
• a. - Like a mountain; mountainous; vast; very great.