The Collaborative International Dictionary of English v.0.48:
Appeasement \Ap*pease"ment\, n. The act of appeasing, or the state of being appeased; pacification. --Hayward. [1913 Webster]WordNet (r) 3.0 (2006):
appeasement n 1: the act of appeasing (as by acceding to the demands of) [syn: appeasement, calming]