anniversary [anniversaries](day an exact number of years since an event) noun [UK: ˌæ.nɪ.ˈvɜː.sə.ri] [US: ˌæ.nə.ˈvɝː.sə.ri]
jubilee [jubilees](major anniversary of an event, particularly the 50th anniversary of a coronation or marriage) noun [UK: ˈdʒuː.bɪ.liː] [US: ˈdʒuː.bə.ˌli]