Definition of Halloween noun from the Oxford Advanced American Dictionary

 

Halloween

 noun
(also Hallowe'en)noun
NAmE//ˌhæləˈwin//
 
, NAmE//ˌhɑləˈwin//
 
[countable, uncountable]
 
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the night of October 31st when it was believed in the past that dead people appeared from their graves, and which is now celebrated by children who dress as ghosts, witches, etc. and visit people's houses to get candy see also trick or treat
See the Oxford Advanced Learner's Dictionary entry: Halloween