Definition of circumflex noun from the Oxford Advanced American Dictionary

 

circumflex

 noun
noun
NAmE//ˈsərkəmˌflɛks//
 
(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, grave1, tilde, umlaut
See the Oxford Advanced Learner's Dictionary entry: circumflex