calm
/ˈkäm/
noun
a period or condition of freedom from storms, high winds, or rough activity of water
complete absence of wind or presence of wind having a speed no greater than one mile (1.6 kilometers) per hour
a state of tranquility
a sailing ship motionless in the calm
verb
to become calm —usually used with down
to make calm —often used with down
adjective
marked by calm : still
free from agitation, excitement, or disturbance
a calm sea