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

  

rationalism

 noun
noun
BrE BrE//ˈræʃnəlɪzəm//
 
; NAmE NAmE//ˈræʃnəlɪzəm//
 
[uncountable](philosophy)
 
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the belief that all behaviour, opinions, etc. should be based on reason rather than on emotions or religious beliefs
See the Oxford Advanced American Dictionary entry: rationalism