adj., n., & v.
--adj.
1. tranquil, quiet, windless (a calm sea; a calm night).
2 (of a person or disposition) settled; not agitated (remained calm throughout the ordeal).
3 self-assured, confident (his calm assumption that we would wait).
--n.
1. a state of being calm; stillness, serenity.
2 a period without wind or storm.
--v.tr. & intr. (often foll. by down) make or become calm.
Derivatives:
calmly adv. calmness n.
Etymology: ME ult. f. LL cauma f. Gk kauma heat