Source : Webster's Revised Unabridged Dictionary (1913)

Middleman \Mid"dle*man\, n.; pl. {Middlemen}.
   1. An agent between two parties; a broker; a go-between; any
      dealer between the producer and the consumer; in Ireland,
      one who takes land of the proprietors in large tracts, and
      then rents it out in small portions to the peasantry.

   2. A person of intermediate rank; a commoner.

   3. (Mil.) The man who occupies a central position in a file
      of soldiers.