Meaning of “commemorate” - Learner’s Dictionary

commemorate

verb [ T ] us uk /kəˈmeməreɪt/

to do something to show you remember an important person or event in the past with respect:

A ceremony will be held to commemorate the battle.
commemoration noun [ U ] us uk /kəˌmeməˈreɪʃən/

a march in commemoration of the war of independence

(Definition of “commemorate” from the Cambridge Learner’s Dictionary © Cambridge University Press)