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

 

bigwig

 noun
noun
BrE BrE//ˈbɪɡwɪɡ//
 
; NAmE NAmE//ˈbɪɡwɪɡ//
 
(informal)
 
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an important person She had to entertain some boring local bigwigs. Word Origin early 18th cent.: so named from the large wigs formerly worn by distinguished men.
See the Oxford Advanced American Dictionary entry: bigwig