Webster's Revised Unabridged Dictionary · 1913

Placate

Placate , noun

Same as Placard, 4 & 5.

Placate , transitive verb

[Latin placatus, past participle of placare to placate, akin to placere to please. See Please.]

To appease; to pacify; to conciliate.
Therefore is he always propitiated and placated. — Cudworth