/ kəˌmeməˈreɪʃn; NAmE / noun
[ U , C ] 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
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WORD ORIGIN
late Middle English : from Latin commemoratio(n-) , from the verb commemorare bring to remembrance, from com- altogether + memorare relate (from memor mindful).