1. Used in combination to denote the middle
   "in mid-1958"; "a mid-June wedding"
    
2. [slang] Mediocre, average, or unremarkable
   "The food was pretty mid"
    
3. (linguistics, of a vowel) made with a somewhat elevated position of the tongue, midway between the high and the low
   "The 'e' in 'bed' is a mid vowel"

1. In the middle of
   "I found it mid the trees";
   - amid, amidst, among, amongst

See also: middle

Encyclopedia: Mid