Pronunciation: (mid),[key] —adj. 1. being at or near the middle point of: in mid autumn. 2. being or occupying a middle place or position: in the mid nineties of the last century. 3. Phonet.(of a vowel) articulated with an opening above the tongue relatively intermediate between those for high and low: the vowels of beet, bet, and hot are respectively high, mid, and low. Cf. high (def. 23), low (def. 30).