°A vowel which is normally pronounced somewhat longer than other vowels (usually around 1 1/2 to double length); represented in the
IPA by the addition of a colon-like symbol, as, /a:/.
°(English pronunciation) Any of the vowels or
diphthongs resulting from the
Great Vowel Shift's effect on Middle English's original long vowels, and best exhibited in the names of the vowel letters
A,
E,
I,
O,
U. In American lexicography their pronunciation is indicated by a
macron, as,
?.