Anniversary
anniversary
(Latin: anniversarius, returning with the year)
A day celebrated yearly as it returns. The anniversary of the consecration of a bishop is celebrated in each diocese by a special Mass in the liturgy for this feast . The anniversary of the consecration (or dedication) of a church is celebrated by a special Mass and Office provided for this feast . The anniversary of the death of a person is celebrated annually and also on the third, seventh, and thirtieth day after the decease. There is a special Requiem Mass in the Roman Missal for the anniversary; it is customary also to offer other prayers and good works on this occasion. The anniversary of burial is sometimes commemorated instead of the day of death, with the same rites.
Fuente: New Catholic Dictionary
Anniversary
in the Greek and Romish Churches, a name given to the day on which a martyr or saint is commemorated. Also, those days on which special prayer is made, year by year, for the souls of deceased persons, and masses said and alms distributed, are in the Romish Church called anniversaries. The anniversary office (officium anniversarium) is a double office, said only on the first anniversary day after the death. On all succeeding anniversary days, the simple office is said, as in the daily office for the dead.Landon, Eccl. Dict. s.v.