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

diaeresis

noun (British English) (US dieresis)
daɪˈerəsɪs
 
; daɪˈerəsɪs
 
plural diaereses, diereses
daɪˈerəsiːz
 
; daɪˈerəsiːz
 
(technical)
 
the mark placed over a vowel to show that it is pronounced separately, as in naïve
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