year's mind
/ˈjɪəz ˈmʌɪnd/ /ˈjəːz ˈmʌɪnd/Chiefly Roman Catholic Church
noun
The commemoration of a deceased person by the celebration of a requiem mass, prayers, etc., on a day one year from the date of the death or funeral, or every year on the anniversary of this date.
Origin
Late Middle English; earliest use found in The Prymer, or lay folks' prayer book. In some forms (i) from the genitive of year + mind;.