Definition of Yom Kippur noun from the Oxford Advanced American Dictionary

 

Yom Kippur

 noun
noun
NAmE//ˌyoʊm kɪˈpʊr//
 
, NAmE//ˌyɑmkɪˈpʊr//
 
, NAmE//ˌyɑmˈkɪpər//
 
, NAmE//ˌyoʊm ˈkɪpər//
 
[uncountable]
 
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a Jewish religious holiday in September or October when people eat nothing all day and say prayers of penitence, also known as the Day of Atonement
See the Oxford Advanced Learner's Dictionary entry: Yom Kippur