An Etymological Dictionary of Astronomy and Astrophysics

1. An act of reconciling, as when former enemies agree to an amicable truce.
   

   2. The state of being reconciled, as when someone becomes resigned to something not desired.
      

   3. The process of making consistent or compatible (Dictionary.com).

Etymology (EN): From O.Fr. reconciliacion and directly from L. reconciliationem noun of action from p.p. stem of reconciliare. “to bring together again; regain,” from → re- “again” + concilare “make friendly”

Etymology (PE): šti, from Mid.Pers. âštêh “peace;” Av. āšti- “peace, treaty of peace; agreement,” āxšta– “pacified, appeased.”