The Collaborative International Dictionary of English v.0.48:

Calm \Calm\ (k[aum]m), a. [Compar. Calmer (-[~e]r); superl.
   Calmest (-[e^]st)]
   1. Not stormy; without motion, as of winds or waves; still;
      quiet; serene; undisturbed. "Calm was the day." --Spenser.
      [1913 Webster]

            Now all is calm, and fresh, and still. --Bryant.
      [1913 Webster]

   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.
      [1913 Webster]

            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.
        [1913 Webster]