Definition of mid- combining form from the Oxford Advanced Learner's Dictionary

  

mid-

 combining form
combining form
BrE BrE//mɪd//
 
; NAmE NAmE//mɪd//
 
 
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(in nouns and adjectives) in the middle of mid-morning coffee She's in her mid-thirties. Word Origin Old English midd, of Germanic origin; from an Indo-European root shared by Latin medius and Greek mesos.
See the Oxford Advanced American Dictionary entry: mid-