Appeasement is the act of calming something down. A candy bar might give your hunger temporary appeasement, but eventually you'll need a real meal.
The noun appeasement comes from the verb appease, which itself comes from the French words a ("to") and pais ("peace"). We wouldn't use appeasement to talk about deep inner calm, but rather satisfying demands, or bringing a turbulent situation back to calm, and in a way that often meets with disapproval. The ransom of $50,000, for instance, is an appeasement for the kidnappers.