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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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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