noun

1. lack of wind or motion; stillness
2. lack of agitation or excitement; tranquillity; serenity
3. Meteorol. a condition in which the air movement is less than one mile per hour

Etymology: ME & OFr calme < OIt calma < LL (Vulg.: Job 30:30) cauma, heat, heat of the day (hence, in It, time to rest, quiet: see siesta) < Gr kauma, heat, esp. of the sun < kaiein, to burn; It sp. infl. by L calere, to be hot

adjective

1. without wind or motion; still; quiet
2. not agitated or excited; tranquil or cool

transitive verb, intransitive verb