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

 

polymath

 noun
noun
BrE BrE//ˈpɒlimæθ//
 
; NAmE NAmE//ˈpɑːlimæθ//
 
(formal, approving)
 
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a person who knows a lot about many different subjects Word Origin early 17th cent.: from Greek polumathēs ‘having learned much’, from polu- ‘much’ + the stem of manthanein ‘learn’.
See the Oxford Advanced American Dictionary entry: polymath