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

 

circumflex

 noun
noun
BrE BrE//ˈsɜːkəmfleks//
 
; NAmE NAmE//ˈsɜːrkəmfleks//
 
(also circumflex accent)
 
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the mark placed over a vowel in some languages to show how it should be pronounced, as over the o in rôle compare acute accent, grave2, tilde, umlaut Word Origin late 16th cent.: from Latin circumflexus (from circum ‘around, about’ + flectere ‘to bend’), translating Greek perispōmenos ‘drawn around’.
See the Oxford Advanced American Dictionary entry: circumflex