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



BrE BrE//ˈmækrɒn//
; NAmE NAmE//ˈmeɪkrɑːn//
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the mark (¯ ) which is placed over a vowel in some languages and in the International Phonetic Alphabet to show that the vowel is stressed or long Word Originmid 19th cent.: from Greek makron, neuter of makros ‘long’.
See the Oxford Advanced American Dictionary entry: macron