year-day
/ˈjɪədeɪ/ /ˈjəːdeɪ/noun
Christian Church. The anniversary of a person's death as an occasion for holding an office or service, either in commemoration or to pray for the person's soul; compare obit year's mind Also generally : †an anniversary ( obsolete ). Now historical and rare.
Origin
Old English (in an earlier sense). From year + day.