Know how to use "fewer" and "less"? Find out.
mid-14c., of persons, from Old French reconcilier (12c.) and directly from Latin reconcilare "to bring together again; regain; win over again, conciliate," from re- "again" (see re-) + concilare "make friendly" (see conciliate). Reflexive sense is recorded from 1530s. Meaning "to make (discordant facts or statements) consistent" is from late 14c. Intransitive sense of "become reconciled" is from 1660s. Related: Reconciled; reconciling.