Definition of du jour adjective from the Oxford Advanced Learner's Dictionary

 

du jour

 adjective
adjective
BrE BrE//duː ˈʒʊə(r)//
 
; NAmE NAmE//duː ˈʒʊr//
 
[after noun](informal, humorous)
 
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very popular or important now This age group is the target group du jour. What is the Internet phenomenon du jour? From French, meaning ‘of the day’.
See the Oxford Advanced American Dictionary entry: du jour