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[mey-kron, mak-ron] /ˈmeɪ krɒn, ˈmæk rɒn/
a horizontal line used as a diacritic over a vowel to indicate that it has a long sound or other specified pronunciation, as (ā) in fate (fāt).
Origin of macron
1850-55; noun use of Greek makrón, neuter of makrós long. See macro- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for macron


a diacritical mark (¯) placed over a letter, used in prosody, in the orthography of some languages, and in several types of phonetic respelling systems, to represent a long vowel
Word Origin
C19: from Greek makron something long, from makros long
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for macron

"short horizontal line placed over a vowel to indicate length," 1827, from Greek makron, neuter of makros "long" (see macro-).

Online Etymology Dictionary, © 2010 Douglas Harper
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