ETYM Old Eng. calme, French calme, from Italian or Spanish calma (cf. Portu. calma heat), prob. from Late Lat. cauma heat, from Greek kayma burning heat, from kaiein to burn. Related to Caustic.
Freedom from motion, agitation, or disturbance; tranquility; stillness; quiet; serenity.
A period of calm weather; SYN. quiet.