macron
noun
ma·cron ˈmā-ˌkrän 
ˈma-,
-krən : a mark − placed over a vowel to indicate that the vowel is long or placed over a syllable or used alone to indicate a stressed or long syllable in a metrical foot
Word History
Etymology
borrowed from Greek makrón, neuter of makrós "long (in time)" — more at macro-
First Known Use
1851, in the meaning defined above
Kids Definition
macron
noun
ma·cron ˈmā-ˌkrän
: a mark − placed over a vowel to show that the vowel is long
Biographical Definition
Macron
biographical name
Ma·cron mä-ˈkrōⁿ
Emmanuel (Jean-Michel Frédéric) 1977– president of France (2017– )