Calm (käm), n. [OE. calme, F. calme, fr. It. or Sp. calma (cf. Pg. calma heat), prob. fr. LL. cauma heat, fr. Gr. kay^ma burning heat, fr. kaiein to burn; either because during a great heat there is generally also a calm, or because the hot time of the day obliges us seek for shade and quiet; cf. Caustic] Freedom from motion, agitation, or disturbance; a cessation or absence of that which causes motion or disturbance, as of winds or waves; tranquility; stillness; quiet; serenity.
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The wind ceased, and there was a great calm. Mark. iv. 39.
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A calm before a storm is commonly a peace of a man's own making. South.
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Calm (käm), a. [Compar. Calmer (-&etilde_;r); superl. Calmest (-&ebreve_;st)] 1. Not stormy; without motion, as of winds or waves; still; quiet; serene; undisturbed. “Calm was the day.” Spenser.
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Now all is calm, and fresh, and still. Bryant.
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2. Undisturbed by passion or emotion; not agitated or excited; tranquil; quiet in act or speech. “Calm and sinless peace.” Milton. “With calm attention.” Pope.
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Such calm old age as conscience pure
And self-commanding hearts ensure. Keble.

Syn. -- Still; quiet; undisturbed; tranquil; peaceful; serene; composed; unruffled; sedate; collected; placid.
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