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

  

isolationism

 noun
noun
BrE BrE//ˌaɪsəˈleɪʃənɪzəm//
 
; NAmE NAmE//ˌaɪsəˈleɪʃənɪzəm//
 
[uncountable] International relations
 
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the policy of not becoming involved in the affairs of other countries or groups Culture The US has often followed this policy, especially before the mid 20th century. George Washington, in his Farewell Address, advised Americans to avoid strong connections with other nations. The US delayed entering both World Wars because of its isolationism. See related entries: International relations
See the Oxford Advanced American Dictionary entry: isolationism