[kahm; older use kam; spelling pronunciation kahlm]
adjective, calmer, calmest.
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.
verb (used with object)
to make calm: He calmed the excited dog.
verb (used without object)
to become calm (usually followed by down ).

1350–1400; (noun, adj.) Middle English calm(e) < Italian calma (noun), calmo (adj.) < Late Latin cauma summer heat (with l perhaps from Latin calēre to be hot) < Greek kaûma (stem kaumat-) burning heat; akin to kaíein to burn (see caustic); (v.) Middle English calmen < Italian calmare, derivative of the noun

calmingly, adverb
calmly, adverb
calmness, noun
quasi-calm, adjective
quasi-calmly, adverb
uncalm, adjective
uncalmly, adverb
uncalmness, noun

1. quiet, motionless. 3. placid, peaceful, serene, self-possessed. Calm, collected, composed, cool imply the absence of agitation. Calm implies an unruffled state, especially under disturbing conditions: calm in a crisis. Collected implies complete inner command of oneself, usually as the result of an effort: He remained collected in spite of the excitement. One who is composed has or has gained dignified self-possession: pale but composed. Cool implies clarity of judgment along with apparent absence of strong feeling or excitement, especially in circumstances of danger or strain: so cool that he seemed calm. 7. still, quiet, tranquilize; allay, assuage, mollify, soothe, soften.

2. tempestuous. 3. agitated.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
calm (kɑːm)
1.  almost without motion; still: a calm sea
2.  meteorol of force 0 on the Beaufort scale; without wind
3.  not disturbed, agitated, or excited; under control: he stayed calm throughout the confusion
4.  tranquil; serene: a calm voice
5.  an absence of disturbance or rough motion; stillness
6.  absence of wind
7.  tranquillity
8.  (often foll by down) to make or become calm
[C14: from Old French calme, from Old Italian calma, from Late Latin cauma heat, hence a rest during the heat of the day, from Greek kauma heat, from kaiein to burn]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., from O.Fr. calme, traditionally from O.It. calma, from L.L. cauma "heat of the mid-day sun" (in Italy, a time when everything rests and is still), from Gk. kauma "heat" (especially of the sun), from kaiein "to burn." Spelling influenced by L. calere "to be hot." Figurative application to social
or mental conditions is 16c.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
Children Affected with Lymphatic Malformations
The American Heritage® Abbreviations Dictionary, Third Edition
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