late 14c., from Late Latin coronationem (nominative coronatio) "a crowning," from past participle stem of Latin coronare "to crown," from corona "crown" (see crown (n.)).[coronation etymology, coronation origin, 英语词源]
late 12c., from Old French coroner, from corone (see crown (n.)). Related: Crowned; crowning. The latter in its sense of "that makes complete" is from 1650s.