Definition of sectarianism noun from the Oxford Advanced American Dictionary

 

sectarianism

 noun
noun
NAmE//sɛkˈtɛriəˌnɪzəm//
 
[uncountable](often disapproving)
 
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strong support for one particular religious or political group, especially when this leads to violence between different groups
See the Oxford Advanced Learner's Dictionary entry: sectarianism