calm

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Nearly or completely motionless; undisturbed.
• adjective Not excited or agitated; composed.
• noun An absence or cessation of motion; stillness.
• noun A condition of no wind or a wind with a speed of less than 1 knot (1.15 miles per hour; 1.9 kilometers per hour), according to the Beaufort scale.
• noun Tranquility or serenity.
• transitive & intransitive verb To make or become calm or quiet.

from The Century Dictionary.

• noun The condition of being without motion, agitation, or disturbance; stillness: properly of the air, and hence of the sea and of the weather in general.
• noun Freedom from mental agitation or passion; tranquillity; quiet; serenity.
• noun The scum of liquor.
• Without motion; still; not stormy; undisturbed; not agitated; serene.
• Free from mental agitation; undisturbed by passion; not agitated or excited; quiet; serene; tranquil, as the mind, temper, or attention: as, “calm words,”
• Synonyms Calm, Placid, Tranquil, Serene, Quiet, Cool, Composed, Collected, smooth, peaceful, unruffled, imperturbable. All the italicized words, when applied to the mind, still suggest the physical phenomena which they primarily denote. Calm implies that the mind remains unagitated, even by care and anxiety. There is a tendency to use the word to express the most complete mastery of the emotions; but it is also used for the mere outward manner: as, in spite of his anger, he remained calm. Placid is by derivation associated with the notion of pleasure; it generally applies to that which belongs to the nature, but is also especially used of the face: as, a placid smile. Tranquil implies not so much a mastery of self amid disturbing circumstances as freedom from that which agitates, a settled calm. Serene, by its association with the aspects of the sky, implies an exalted calm, a tranquillity that rises above clouds or storms. Quiet, when applied to the disposition, implies that the person is naturally silent and undemonstrative; externally it implies that one is free from annoyances: as, to leave him in quiet. Like tranquil, but unlike the rest, it is not suggestive of a triumph of self-control over natural agitation of feelings or confusion of mind. Cool is the opposite of heated; it indicates that state in which the heat of feeling is perfectly kept down, so that the intellectual faculties are not hindered from their best operation. Composed is applicable to the state of both thoughts and feelings, while collected, gathered together, can be used only with reference to the thoughts. Composed differs from collected also in expressing, like calm, merely a frame of mind; while collected, like cool, expresses a readiness for action with the full and unimpeded force of the mind. See apathy.
• noun A cog of a wheel.
• noun plural A mold; a frame, etc.
• noun plural The small cords through which the warp is passed in a loom.
• To still; quiet, as the wind or elements.
• To still, appease, allay, or pacify, as the mind or passions.
• To becalm.
• To become calm or quiet: as, the tempest now began to calm.
• noun A dialectal form of qualm.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To make calm; to render still or quiet, as elements.
• intransitive verb To deliver from agitation or excitement; to still or soothe, as the mind or passions.
• noun 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.
• adjective Not stormy; without motion, as of winds or waves; still; quiet; serene; undisturbed.
• adjective Undisturbed by passion or emotion; not agitated or excited; tranquil; quiet in act or speech.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective of a person Peaceful, quiet, especially free from anger and anxiety.
• adjective of a place or situation Free of noise and disturbance.
• adjective of water with little waves on the surface.
• noun in a person The state of being calm; peacefulness; absence of worry, anger, fear or other strong negative emotion.
• noun in a place or situation The state of being calm; absence of noise and disturbance.
• noun A period of time without wind.
• verb transitive To make calm.
• verb intransitive To become calm.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb make calm or still
• adjective not agitated; without losing self-possession
• adjective (of weather) free from storm or wind
• noun wind moving at less than 1 knot; 0 on the Beaufort scale
• verb make steady
• verb cause to be calm or quiet as by administering a sedative to
• verb become quiet or calm, especially after a state of agitation
• noun steadiness of mind under stress