Etymology
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placation (n.)

"act of pleasing, pacifying, or conciliating," 1580s, from French placation (16c.), from Latin placationem (nominative placatio) "an appeasing, pacifying, quieting," noun of action from past-participle stem of placare "to calm, appease, quiet, soothe, assuage," causative of placere "to please" (see please).

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lucid (adj.)
1590s, "bright, shining" (a sense now obsolete or restricted), from Latin lucidus "light, bright, clear," figuratively "perspicuous, lucid, clear," from lucere "to shine," from lux (genitive lucis) "light," from PIE root *leuk- "to shine, be bright."

Sense of "easy to understand, free from obscurity of meaning, marked by intellectual clarity" first recorded 1786. Lucid interval "period of calm or temporary sanity" (1580s) is from Medieval Latin lucida intervalla (plural), common in medieval legal documents (non est compos mentis, sed gaudet lucidis intervallis, etc.). The notion probably is of a period of calm and clear during a storm. Related: Lucidly; lucidness (1640s).
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still (v.)
Old English stillan "to be still, have rest; to quiet, calm, appease; to stop, restrain," from stille "at rest" (see still (adj.)). Cognate with Old Saxon stillian, Old Norse stilla, Dutch, Old High German, German stillen. Related: Stilled; stilling.
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intemperate (adj.)
"characterized by excessive indulgence in a passion or appetite," late 14c., from Latin intemperatus "excessive, immoderate," from in- "not, opposite of" (see in- (1)) + temperatus "restrained, regulated, limited, moderate, sober, calm, steady," past participle of temperare "to moderate" (see temper (v.)). Related: Intemperately.
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Kyoto 
city in Japan, from kyo + to, both meaning "capital." Founded 794 as Heionkyo "Capital of Calm and Peace," it also has been known as Miyako and Saikyo. Kyoto Protocol so called because it was initially adopted Dec. 11, 1997, in the Japanese city.
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temper (n.)
late 14c., "due proportion of elements or qualities," from temper (v.). The sense of "characteristic state of mind, inclination, disposition" is first recorded 1590s; that of "calm state of mind, tranquility" in c. 1600; and that of "angry state of mind" (for bad temper) in 1828. Meaning "degree of hardness and resiliency in steel" is from late 15c.
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sedate (v.)

"treat with sedatives," by 1945, a verb to go with the noun derivative of sedative (adj.). The word also existed 17c. in English with a sense of "make calm or quiet." Related: Sedated (by 1953 as an adjective, "under the influence of a sedative drug"); sedating.

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pacify (v.)

late 15c., pacifien, "appease, allay the anger of (someone)," from Old French pacifier, paciifier, "make peace," from Latin pacificare "to make peace; pacify," from pacificus "peaceful, peace-making," from pax (genitive pacis) "peace" (see peace). Of countries or regions, "to bring to a condition of calm, to restore peace to," late 15c., from the start with suggestions of forced submission and terrorization. Related: Pacified; pacifying.

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composure (n.)

c. 1600, "composition, act of composing, constructing, arrangement" (also, in early use, with many senses now given to compound (n.2)), from compose + -ure. Sense of "tranquility, calmness, composed state of mind" is first recorded 1660s, from composed "calm" (c. 1600). For sense, compare colloquial fall apart "lose one's composure."

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placable (adj.)

c. 1500, "pleasing, agreeable" (a sense now obsolete), from Old French placable "forgiving, conciliatory" and directly from Latin placabilis "easily appeased or pacified," from placare "to calm, appease, quiet, soothe, assuage," causative of placere "to please" (see please). From 1580s as "capable of being pleased or pacified, easily appeased, willing to forgive." Related: Placably; placability.

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