adjective
(of a person) Peaceful, quiet, especially free from anger and anxiety.
(of a place or situation) Free of noise and disturbance.
(of water) with few or no waves on the surface; not rippled.
(of weather) Without wind or storm.
(slang, MLE) Good; alright; cool; OK.
noun
(in a person) The state of being calm; peacefulness; absence of worry, anger, fear or other strong negative emotion.
(in a place or situation) The state of being calm; absence of noise and disturbance.
(meteorology) The absense of wind; a period of time without wind.
verb
(transitive) To make calm.
(intransitive) To become calm.