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

 

thoughtcrime

 noun
noun
BrE BrE//ˈθɔːtkraɪm//
 
; NAmE NAmE//ˈθɔːtkraɪm//
 
[uncountable, countable]
 
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an idea or opinion that is considered socially unacceptable or criminal Word Origin 1949: from George Orwell's novel Nineteen Eighty-Four.
See the Oxford Advanced American Dictionary entry: thoughtcrime