Definition of fraternization noun from the Oxford Advanced Learner's Dictionary

 

fraternization

 noun
(British English also -isation)noun
BrE BrE//ˌfrætənaɪˈzeɪʃn//
 
; NAmE NAmE//ˌfrætərnəˈzeɪʃn//
 
[uncountable](disapproving)
 
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friendly behaviour, especially towards somebody that you are not supposed to be friendly with