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

  

externalization

 noun
(British English also -isation)noun
BrE BrE//ɪkˌstɜːnəlaɪˈzeɪʃn//
 
; NAmE NAmE//ɪkˌstɜːrnələˈzeɪʃn//
 
[uncountable](formal)
 
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the act of showing what you are thinking or feeling by what you say or do