Source : Webster's Revised Unabridged Dictionary (1913)

Placate \Pla"cate\, v. t. [imp. & p. p. {Placated}; p. pr. & vb.
   n. {Placating}.] [L. placatus, p. p. of placare to placate,
   akin to placere to please. See {Please}.]
   To appease; to pacify; to concilate. ``Therefore is he always
   propitiated and placated.'' --Cudworth.