Definition of commemoration noun from the Oxford Advanced Learner's Dictionary

 

commemoration

 noun
noun
BrE BrE//kəˌmeməˈreɪʃn//
 
; NAmE NAmE//kəˌmeməˈreɪʃn//
 
[uncountable, countable]
 
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an action, or a ceremony, etc. that makes people remember and show respect for an important person or event in the past a commemoration service a statue in commemoration of a national hero Protests and commemorations took place in several cities on the anniversary of the uprising. a statue in commemoration of the founder of the nation/of the soldiers’ sacrifice Word Origin late Middle English: from Latin commemoratio(n-), from the verb commemorare ‘bring to remembrance’, from com- ‘altogether’ + memorare ‘relate’ (from memor ‘mindful’).
See the Oxford Advanced American Dictionary entry: commemoration