Definition of All Saints’ Day noun from the Oxford Advanced Learner's Dictionary

 

All Saints’ Day

 noun
noun
BrE
 
; NAmE
 
Religious holidays and festivals
 
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a Christian festival in honour of the saints, held on 1 November See related entries: Religious holidays and festivals Culture All Saints' Day is also known as All Hallows. The night before, known as All Hallows' Eve, is now usually called Halloween.
See the Oxford Advanced American Dictionary entry: All Saints’ Day