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

 

expectancy

 noun
noun
BrE BrE//ɪkˈspektənsi//
 
; NAmE NAmE//ɪkˈspektənsi//
 
[uncountable]
 
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the state of expecting or hoping that something, especially something good or exciting, will happen There was an air of expectancy among the waiting crowd. see also life expectancy Word Origin early 17th cent.: from Latin exspectantia, from exspectare ‘look out for’, from ex- ‘out’ + spectare ‘to look’.
See the Oxford Advanced American Dictionary entry: expectancy

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