To still; soothe; tranquilize.
Calmness.
Tranquillity; stillness; serenity.
Free from agitation; quiet; placid; serene.
It was a very calm, quiet voice. – Out Like a Light by Gordon Randall Garrett
He does not become calm! – The George Sand-Gustave Flaubert Letters by George Sand, Gustave Flaubert Translated by A.L. McKensie