■ 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.
↘( ~s ) an area of the sea without wind.
■ verb (often ~ down ) make or become tranquil and quiet.
Derivatives
~ly adverb
~ness noun
Origin
ME: via one of the Romance languages from Gk kauma 'heat (of the day)'.