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

 

populism

 noun
noun
BrE BrE//ˈpɒpjəlɪzəm//
 
; NAmE NAmE//ˈpɑːpjəlɪzəm//
 
[uncountable]
 
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a type of politics that claims to represent the opinions and wishes of ordinary people Word Origin late 19th cent. (originally referring to a US political party): from Latin populus ‘people’ + -ism.
See the Oxford Advanced American Dictionary entry: populism