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

 

Australia Day

 noun
noun
BrE BrE//ɒˈstreɪliə deɪ//
 
; NAmE NAmE//ɔːˈstreɪljə deɪ//
 
, NAmE//ɑːˈstreɪljə deɪ//
 
 
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a national public holiday in Australia on 26 January, when people remember the founding of New South Wales on that date in 1788