Origin of Placate
From Latin plācātus, past participle of plācō (“appease, placate", literally “smooth, smoothen"), from Proto-Indo-European *plāk- (“smooth, flat"), from Proto-Indo-European *pele- (“broad, flat, plain"). Related to Latin placeō (“appease"), Old English flōh (“flat stone, chip"). More at please.
Latin plācāre plācāt- to calm plāk-1 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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