mid-

prefix

Etymology: See mid.

1. Denoting the middle part.

   “He's in his mid-thirties — meaning he is roughly around the age of 33-37, as opposed to one's early thirties (aged roughly 30–33) and one's late thirties (aged roughly around 37-39).”

   “He was born in the mid-1930s.”

2. Occupying a middle position.

   “a mid-shoulder stretch”

3. Intermediate

   “mid-key, midclass, midgut, midbrow”

4. Amid.
5. During, in the middle of doing something.

   “He was hit by a ball mid-jump.”