Adjective mountain has 1 sense
  1. mountain - relating to or located in mountains; "mountain people"
    Antonym:
    lowland (indirect, via upland)
,Noun mountain has 2 senses
  1. mountain, mount - a land mass that projects well above its surroundings; higher than a hill
    --1 is a kind of natural elevation, elevation
    --1 has parts: mountain peak; mountainside, versant
    --1 has particulars: alp; ben; seamount; volcano
  2. tons, dozens, heaps, lots, mountain, piles, scores, stacks, loads, rafts, slews, wads, oodles, gobs, scads, lashings - a large number or amount; "made lots of new friends"; "she amassed a mountain of newspapers"
    --2 is a kind of large indefinite quantity, large indefinite amount
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