1.NounThe act of commemorating; an observance or celebration to honor the memory of some person or event.
"commemoration ceremony; in commemoration of; annual commemoration; A statue was built in commemoration of the event.; The service was held in commemoration of fallen soldiers."
2.NounThat which serves the purpose of commemorating; a memorial.
3.NounThe specification of individual saints in the prayers for the dead.
4.NounThe great festival of the Oxford academic year, usually taking place on the third Wednesday after Trinity Sunday.