"tending to conciliate," 1570s, from conciliate + -ory. Related: Conciliator "one who conciliates" (1570s). Conciliative "designed to produce conciliation" is attested from 1817.
a conciliatory visit
conch
conchology
concierge
conciliate
conciliation
conciliatory
concinnity
concise
conciseness
concision
conclave