Definition of daylong adjective from the Oxford Advanced Learner's Dictionary

 

daylong

 adjective
adjective
BrE BrE//ˈdeɪlɒŋ//
 
; NAmE NAmE//ˈdeɪlɔːŋ//
 
[only before noun](especially North American English)
 
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lasting for a whole day a daylong meeting
See the Oxford Advanced American Dictionary entry: daylong