English

Definition of why exclamation from the Oxford Advanced Learner's Dictionary

 

why

 exclamation
exclamation
BrE BrE//waɪ//
 
; NAmE NAmE//waɪ//
 
 
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(old-fashioned or North American English) used to express surprise, lack of patience, etc. Why Jane, it's you! Why, it's easy—a child could do it! Word Origin Old English hwī, hwȳ ‘by what cause’, instrumental case of hwæt ‘what’, of Germanic origin.
See the Oxford Advanced American Dictionary entry: why