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



(British English) (US English dieresis) noun
BrE BrE//daɪˈerəsɪs//
; NAmE NAmE//daɪˈerəsɪs//
(pl. diaereses, diereses
BrE BrE//daɪˈerəsiːz//
; NAmE NAmE//daɪˈerəsiːz//
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the mark placed over a vowel to show that it is pronounced separately, as in naïve Word Originlate 16th cent. (denoting the division of one syllable into two): via Latin from Greek diairesis ‘separation’, from diairein ‘take apart’, from dia ‘apart’ + hairein ‘take’.