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. it is for one of the eight primary cardinal vowels, not directly included to correspond to a vowel sound of a specific Linguistic communication but rather to serve as a fundamental address point in a phonetic measuring system.

The symbol in the vowel chart it is for 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 non quite as open as that by John Wells.

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

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