conciliate

verb4

1. •
   To make calm and content, or regain the goodwill of; to placate; to propitiate.

   • `Surely, my father,' I answered courteously, feeling certain that I should do well to conciliate this ancient Mammon of Unrighteousness. — 1886
2. •
   To mediate in a dispute.
3. •
   (no longer used) To reconcile (discordant theories, demands etc.); to make compatible, bring together.
4. •
   (no longer used) To acquire, to procure.

   • Frankness and openness conciliate confidence. We trust the man who seems willing to trust us. — 1790