One of the three main dimensions of vowels, reflecting the position of the tongue relative to the front or back of the mouth. The other dimensions are roundness and vowel height.

One of the three main dimensions of vowels, reflecting the position of the tongue relative to the front or back of the mouth.

The other vowel dimensions are and .

Front vowels in the main varieties of English are (in IPA):

/i/ /e/ /ɛ/ /æ/ /a/

Back vowels in the main varieties of English are (in IPA):

/u/ /o/ /ʌ/ /ɔ/ /ɑ/ /ɒ/

The mid position between front and back is called central and the intermediate positions are called near front and near back.