Definition of calm:

part of speech: verb

To still; to quiet; to free from agitation; to pacify; to tranquillise.

part of speech: noun

Stillness; quiet; repose; freedom from agitation or motion.

part of speech: adjective

Still; quiet; tranquil; undisturbed.

Usage examples:

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In arch., a term applied to sculptured objects in their full forms, in contradistinction to those which are in relief, or attached more or less to a plane or ground. ...