Source : Webster's Revised Unabridged Dictionary (1913)

Placation \Pla*ca"tion\, n. [L. placatio.]
   The act of placating. [R.] --Puttenham (1589).

Source : WordNet®

placation
     n : the act of placating and overcoming distrust and animosity
         [syn: {conciliation}, {propitiation}]