CONCILIATE

accommodate, reconcile, conciliate

(verb) make (one thing) compatible with (another); “The scientists had to accommodate the new results with the existing theories”

reconcile, patch up, make up, conciliate, settle

(verb) come to terms; “After some discussion we finally made up”

pacify, lenify, conciliate, assuage, appease, mollify, placate, gentle, gruntle

(verb) cause to be more favorably inclined; gain the good will of; “She managed to mollify the angry customer”

Source: WordNet® 3.1

Etymology

Verb

conciliate (third-person singular simple present conciliates, present participle conciliating, simple past and past participle conciliated)

(transitive) To make calm and content, or regain the goodwill of; to placate.

(intransitive) To mediate in a dispute.

Source: Wiktionary

Con*cil"i*ate, v. t. [imp. & p. p. Conciliated; p. pr & vb. n. Conciliating.] Etym: [L. conciliatus, p. p. of conciliare to draw or bring together, unite, from concilium council. See Council.]

Definition: To win ower; to gain from a state of hostility; to gain the good will or favor of; to make friendly; to mollify; to propitiate; to appease. The rapacity of his father's administration had excited such universal discontent, that it was found expedient to conciliate the nation. Hallam.

Syn.

– To reconcile; propitiate; appease; pacify.

Source: Webster’s Unabridged Dictionary 1913 Edition