The Collaborative International Dictionary of English v.0.48:
Calm \Calm\ (k[aum]m), a. [Compar. Calmer (-[~e]r); superl.
1. Not stormy; without motion, as of winds or waves; still;
quiet; serene; undisturbed. "Calm was the day." --Spenser.
Now all is calm, and fresh, and still. --Bryant.
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.
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.