¦ adjective
1. not showing or feeling nervousness, anger, or other emotions.
2. (of a place) peaceful and undisturbed.
(of weather or the sea) free from wind.
¦ noun
1. the state or fact of being peaceful or tranquil.
2. the absence of wind.
(calms) an area of the sea without wind.
¦ verb (often calm down) make or become tranquil and quiet.
Derivatives
calmly adverb
calmness noun
Origin
ME: via one of the Romance languages from Gk kauma 'heat (of the day)'.