† adˈvenementObs.rare—1. [a. MFr. advenement, occas. spelling of avénement a coming, an event, f.avenir: see prec. and -ment.] That which comes or happens; an event, incident. 1490Caxton Eneydos i. 12 The aduenementes and aduersitees of warre ben doubtous and vnder the honde of fortune.