conciliation n.

"overcome distrust or hostility of by soothing and pacifying," 1540s, from Latin conciliatus, past participle of conciliare "to bring together, unite in feelings, make friendly," from concilium "a meeting, a gathering of people," from assimilated form of com "together, together with" (see com-) + PIE *kal-yo-, suffixed form of root *kele- (2) "to shout" (the notion is of "a calling together"). Related: Conciliated; conciliating; conciliary. The earlier verb was Middle English concile "to reconcile" (late 14c.).

*kelə-, Proto-Indo-European root meaning "to shout." Perhaps imitative.

It forms all or part of: acclaim; acclamation; Aufklarung; calendar; chiaroscuro; claim; Claire; clairvoyance; clairvoyant; clamor; Clara; claret; clarify; clarinet; clarion; clarity; class; clear; cledonism; conciliate; conciliation; council; declaim; declare; disclaim; ecclesiastic; eclair; exclaim; glair; hale (v.); halyard; intercalate; haul; keelhaul; low (v.); nomenclature; paraclete; proclaim; reclaim; reconcile.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit usakala "cock," literally "dawn-calling;" Latin calare "to announce solemnly, call out," clamare "to cry out, shout, proclaim;" Middle Irish cailech "cock;" Greek kalein "to call," kelados "noise," kledon "report, fame;" Old High German halan "to call;" Old English hlowan "to low, make a noise like a cow;" Lithuanian kalba "language."