Open front unrounded vowel

Vowels beside dots are: unrounded • rounded

The open front unrounded vowel, or low front unrounded vowel, is the type of vowel sound, used in some spoken languages. this is a one of the eight primary cardinal vowels, not directly specified to correspond to a vowel sound of a specific language but rather to serve as a fundamental address point in a phonetic measuring system.

The symbol in the vowel chart this is the positioned at the lower-left corner. However, the accuracy of the quadrilateral vowel chart is disputed, as alive as the sound has been analyzed acoustically as extra-open at a position where the front/back distinction has lost its significance. There are also differing interpretations of the exact quality of the vowel: the classic sound recording of [a] by Daniel Jones is slightly more front but not quite as open as that by John Wells.

In practice, the symbol ⟨a⟩ is often used to symbolize an near-open front unrounded vowel, or ⟨a̟⟩ with the IPA "advanced" diacritic.

The Hamont-Achel dialect of Limburgish has been provided to contrast long open front, central as well as back unrounded vowels. This is extremely unusual.