Definition of isolationism noun from the Oxford Advanced American Dictionary

  

isolationism

 noun
noun
NAmE//ˌaɪsəˈleɪʃəˌnɪzəm//
 
[uncountable]
 
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the policy of not becoming involved in the affairs of other countries or groups
isolationist
 
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NAmE//ˌaɪsəˈleɪʃənɪst//
 
adjective, noun an isolationist foreign policy
See the Oxford Advanced Learner's Dictionary entry: isolationism