Definition of Columbus Day noun from the Oxford Advanced Learner's Dictionary

 

Columbus Day

 noun
noun
BrE BrE//kəˈlʌmbəs deɪ//
 
; NAmE NAmE//kəˈlʌmbəs deɪ//
 
[uncountable, countable]
 
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a national holiday in the US on the second Monday in October when people celebrate the arrival of Christopher Columbus in America in 1492
See the Oxford Advanced American Dictionary entry: Columbus Day