| 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. | Phonetics. (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. Compare high (def. 23), low (def. 30). |
| 4. | Archaic. the middle. |

MID abbr.
minimal infecting dose