Pronunciation: (u-pēz'),[key] —v.t.,-peased, -peas•ing. 1. to bring to a state of peace, quiet, ease, calm, or contentment; pacify; soothe: to appease an angry king. 2. to satisfy, allay, or relieve; assuage: The fruit appeased his hunger. 3. to yield or concede to the belligerent demands of (a nation, group, person, etc.) in a conciliatory effort, sometimes at the expense of justice or other principles.