conciliate

(verb) cause to be more favorably inclined; gain the good will of. Synonyms: pacify, lenify, assuage, appease, mollify, placate, gentle, gruntle. Example: "She managed to mollify the angry customer."

(verb) come to terms. Synonyms: reconcile, patch up, make up, settle. Example: "After some discussion we finally made up."

(verb) make (one thing) compatible with (another). Synonyms: accommodate, reconcile. Example: "The scientists had to accommodate the new results with the existing theories."