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1. Cause to be more favourably inclined; gain the good will of
   "She managed to conciliate the angry customer"
   - pacify, lenify, assuage, appease, mollify, placate, gentle, gruntle
    
2. Come to terms
   - reconcile, patch up, make up, settle
    
3. Make (one thing) compatible with (another)
   "The scientists had to conciliate the new results with the existing theories"
   - accommodate, reconcile

Derived forms: conciliates, conciliating, conciliated

See also: conciliation, conciliative, conciliator, conciliatory

Type of: agree, calm, calm down, concord, concur, harmonise [Brit], harmonize, hold, lull, quiet, quieten, still, tranquilize [N. Amer], tranquillise [Brit], tranquillize