plācātĭo, ōnis, f. [placo],
a pacifying , appeasing , propitiating : deorum immortalium, Cic. N. D. 3, 2, 5; id. Tusc. 4, 28, 60.
plācātiō ōnis, f: placo, a pacifying, propitiating, quieting : deorum: perturbati animi. ...
An Elementary Latin Dictionary