American English

Definition of mountain noun from the Oxford Advanced American Dictionary



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  1. 1a very high hill, often with rocks near the top a chain/range of mountains to climb a mountain We spent a week walking in the mountains. to enjoy the mountain air/scenery mountain roads/streams/villages a mountain rescue team There is still snow on the mountain tops.
  2. 2mountain of something (informal) a very large amount or number of something a mountain of work We made mountains of sandwiches.
  3. Idioms
    make a mountain out of a molehill (disapproving)
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    to make an unimportant matter seem important
See the Oxford Advanced Learner's Dictionary entry: mountain