Definition of Celtic twilight noun from the Oxford Advanced Learner's Dictionary

 

Celtic twilight

 noun
noun
BrE
 
; NAmE
 
[uncountable](sometimes ironicsometimes ironic)
 
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the romantic and mysterious atmosphere that many people associate with the Irish people and their literature, including their belief in fairies (= small, imaginary beings with magic powers), ghosts, etc. The Celtic Twilight is the title of a collection of stories (1893) by W B Yeats.