Calm

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.

To make calm; to render still or quiet, as elements; as, to calm the winds.

To deliver from agitation or excitement; to still or soothe, as the mind or passions.

Not stormy; without motion, as of winds or waves; still; quiet; serene; undisturbed.

Undisturbed by passion or emotion; not agitated or excited; tranquil; quiet in act or speech.

wind moving at less than 1 knot; 0 on the Beaufort scale

steadiness of mind under stress; "he accepted their problems with composure and she with equanimity"