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A close-mid vowel (also mid-close vowel, high-mid vowel, mid-high vowel or half-close vowel) is any in a class of vowel sound used in some spoken languages. The defining characteristic of a close-mid vowel is that the tongue is positioned one third of the way from a close vowel to an open vowel.
Partial list
The close-mid vowels that have dedicated symbols in the International Phonetic Alphabet are:
Other close-mid vowels can be indicated with diacritics of relative articulation applied to letters for neighboring vowels.
References
Close-mid vowel Wikipedia(Text) CC BY-SA