mid

1. Middle; central.
2. Being the part in the middle or center: in the mid Pacific.
3. Linguistics. Of, relating to, or being a vowel produced with the tongue in a position approximately intermediate between high and low, as the vowel in but.

[Middle English, from Old English midd.]

[Alteration of AMID.]

adjective

1. At, in, near, or being the center: center, central, medial, median, middle. See edge/center.
2. Not extreme: central, intermediate, mean³, medial, median, middle, middle-of-the-road, midway. See edge/center.

The adjective has one meaning:

Meaning #1: used in combination to denote the middle