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

 

demeanour

 noun
(especially US English demeanor)noun
BrE BrE//dɪˈmiːnə(r)//
 
; NAmE NAmE//dɪˈmiːnər//
 
[uncountable](formal)
 
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the way that somebody looks or behaves He maintained a professional demeanour throughout. Word Origin late 15th cent.: from demean in the archaic sense ‘behaviour’, probably influenced by obsolete havour ‘behaviour’.