Definition of mid- in US English:

mid-

combining form

  • 1Denoting the middle of.

    ‘midsection’
    ‘mid-sentence’
    1. 1.1 In the middle; medium; half.
      ‘midway’

Origin

Old English midd, of Germanic origin; from an Indo-European root shared by Latin medius and Greek mesos.

Pronunciation

mid-

/mɪd//mid/