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

 

mien

 noun
noun
BrE BrE//miːn//
 
; NAmE NAmE//miːn//
 
[singular](formal or literary)
 
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a person’s appearance or manner that shows how they are feeling I was impressed by her calm mien. Word Origin early 16th cent.: probably from French mine ‘expression’, influenced by obsolete demean ‘bearing, demeanour’.
See the Oxford Advanced American Dictionary entry: mien