Possible Definitions:
1. 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.
2. Mountain (n.) A range, chain, or group of such elevations; as, the White Mountains.
3. Mountain (n.) A mountainlike mass; something of great bulk.
4. Mountain (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.
5. Mountain (a.) Like a mountain; mountainous; vast; very great.
