Exact historical dictionary sense
Calm in Webster's 1913 dictionary
The 1913 record labels calm as noun. Its source-bounded etymology and selected historical definition appear below.
[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. kai`ein 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]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "calm" is labeled noun. Its etymology is recorded as: "[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. kai`ein 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]" The selected historical definition says: "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."