mountain

1. (countable) An elevation of land of considerable dimensions rising more or less abruptly, forming a conspicuous figure in the landscape, usually having a small extent of surface at its summit.Examples: "Everest is the highest mountain in the world."; "We spent the weekend hiking in the mountains."; "We collected plant specimens from mountain meadows above 2000 meters."countable

2. (countable) Something very large in size or quantity; a huge amount; a great heap.Examples: "He was a real mountain of a man, standing seven feet tall."; "There's still a mountain of work to do."; "Iraq says the mountain of documentation it has provided to the United Nations shows it is innocent of harbouring weapons of mass destruction. America continues to maintain that it has evidence that this is a pack of lies."countable

3. (figuratively) A difficult task or challenge.Examples: "Five minutes into the game the Black Cats were facing a mountain, partly because of West Brom's newly-found ruthlessness in front of goal but also as a result of the home side's defensive generosity."countablefigurativelyuncountable

4. (uncountable, now historical) Wine from Malaga made from grapes that grow on a mountain.Examples: "Called on Courtenay, with whom I walked to Hampstead Heath, and got into excellent spirits, enjoying fine fresh air; then dined with him tête-a-tête on mutton broth and mackerel and drank mountain and old port moderately."historicaluncountable

5. (countable, slang) A woman's large breast.countableslang

6. (cartomancy) The twenty-first Lenormand card.countableuncountable