a ceremony characterized by remembrance
To remember or mark a particular event or person from the past through ceremony or memorial.
To acknowledge by ceremony, observance, or ritual. One of the four concepts upon which Christian rites and ceremonies are based.
In the Tridentine Mass period of the Roman Rite, when a higher-ranked liturgical celebration impeded the celebration of a lesser that, either permanently or (in a particular year) by coincidence, fell on the same day, the prayer of the lower-ranked celebration was usually added to that of the higher. This additional prayer was referred to as a commemoration of the lesser celebration.
Commemorations are a type of religious observance in the Church of England. They are the least significant type of observance, the others being Principal Feasts, Principal Holy Days, Festivals, and Lesser Festivals. Whereas Principal Feasts must be celebrated, it is not obligatory to observe Commemorations.