macron

A symbol ( ¯ ) placed over a vowel to show that it has a long sound.

The horizontal mark ( ¯ ) used to indicate a stressed or long syllable in a foot of verse.

In grammar, a short horizontal line placed over a vowel to show that it is long in quantity, or, as in English, has a “long” sojnd: opposed to the breve, or mark of a short vowel.

A short, straight, horizontal mark [-], placed over vowels to denote that they are to be pronounced with a long sound; as, ā, in dāme; ē, in sēam, etc.

A short, straight, horizontal diacritical mark (¯) placed over any of various letters. It usually is used to indicate that the pronunciation of the vowel is long, in Mandarin pinyin (Chinese), it indicates the first tone, e.g. chūzūchē.

a diacritical mark (-) placed above a vowel to indicate a long sound