Etymology
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calmly (adv.)
"quietly, peacefully," 1590s, from calm (adj.) + -ly (2).
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Honolulu 
chief city of Hawaii, from Hawaiian hono "port" + lulu "calm."
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becalm (v.)
1550s in nautical use, "deprive a ship of wind," from be- + calm. Meaning "make calm or still" is from 1610s. Related: Becalmed; becalming.
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sedate (adj.)
"calm, quiet," 1660s, from Latin sedatus "composed, moderate, quiet, tranquil," past participle of sedare "to settle, calm," causative of sedere "to sit," from PIE root *sed- (1) "to sit." Related: Sedately.
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placid (adj.)

"gentle, quiet, undisturbed, serene, calm," 1620s, from French placide (15c.) and directly from Latin placidus "pleasing, peaceful, quiet, gentle, still, calm," from placere "to please" (see please). Related: Placidly; placidness.

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serenade (n.)
1640s, "musical performance at night in open air" (especially one given by a lover under the window of his lady), from French sérénade (16c.), from Italian serenata "an evening song," literally "calm sky," from sereno "the open air," noun use of sereno "clear, calm," from Latin serenus "peaceful, calm, serene." Sense influenced by Italian sera "evening," from Latin sera, fem. of serus "late." Meaning "piece of music suitable for a serenade" is attested from 1728.
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placate (v.)

"appease or pacify," 1670s, a back-formation from placation or else from Latin placatus "soothed, quiet, gentle, calm, peaceful," past participle of placare "to calm, appease, quiet, soothe, assuage," causative of placere "to please" (see please). Related: Placated; placating; placatingly.

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calmness (n.)
"quietness, stillness, tranquility," 1510s, from calm (adj.) + -ness.
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Korea 
by 1690s, from Chinese Gao li, name of a dynasty founded 918, literally "high serenity." Japanese Chosen is from Korean Choson, literally "land of morning calm," from cho "morning" + son "calm." Related: Korean (1610s). In early use Corea, Corean.
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serene (adj.)
mid-15c., "clear, calm," from Latin serenus "peaceful, calm, clear, unclouded" (of weather), figuratively "cheerful, glad, tranquil," from Proto-Italic *(k)sero- "dry," from PIE root *ksero- "dry," source also of Greek xeros "dry, arid" (see xerasia). In English, applied to persons since 1630s. Related: Serenely.
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