Calm

without rough motion; still or nearly still:
a calm sea.
not windy or stormy:
a calm day.
free from excitement or passion; tranquil:
a calm face; a calm manner.
freedom from motion or disturbance; stillness.
Meteorology. wind speed of less than 1 mile per hour (0.447 m/sec).
freedom from agitation, excitement, or passion; tranquillity; serenity:
She faced the possibility of death with complete calm.
to make calm:
He calmed the excited dog.
to become calm (usually followed by down).
Contemporary Examples

My Accidental Home Birth Jim Sciutto November 29, 2010
Naipaul’s Art of Darkness Amitava Kumar December 25, 2008
Bill Allen: Tipper Gore’s Secretive New Beau Sandra McElwaine July 5, 2012
Billie Holiday, Barack Obama, and the Pain of Black Women Joshua DuBois June 21, 2014
Meet the Anti-Pot Activists Abby Haglage January 30, 2014

Historical Examples

Weighed and Wanting George MacDonald
The Spenders Harry Leon Wilson
The Trail of ’98 Robert W. Service
Way of the Lawless Max Brand
Ernest Linwood Caroline Lee Hentz

adjective
almost without motion; still: a calm sea
(meteorol) of force 0 on the Beaufort scale; without wind
not disturbed, agitated, or excited; under control: he stayed calm throughout the confusion
tranquil; serene: a calm voice
noun
an absence of disturbance or rough motion; stillness
absence of wind
tranquillity
verb
(often foll by down) to make or become calm
adj.
n.
v.
Children Affected with Lymphatic Malformations