Synonyms for Propitiatory (same or very similar meaning)
WordNet sense 1 (having power to atone for or offered by way of expiation or propitiation):
expiatory, expiativeWordNet sense 2 (intended to reconcile or appease):
propitiativeWordNet sense 3 (intended or likely to overcome animosity or hostility):
conciliatory, conciliativeFrom the ODE community, based on WordNetadd/edit