middleman

n. intermediary; one acting as intermediary between two parties

Middle man or middleman may mean:An employee - typically a salesperson - who acts on behalf of a company when dealing with customersmiddle man (AIM plugin), an AOL Instant Messenger plugin created by Krunch SoftwareMiddleman node, a node in anonymity networks such as Tor or Mixmaster that only forwards messages to other anonymizing nodes and never lets messages exit the networkMan-in-the-middle attack, a type of attack in cryptographyThe Middle Man is a comic published by the notable independent publisher, Viper Comics.
See more at Wikipedia.org...

Noun
1. someone who buys large quantities of goods and resells to merchants rather than to the ultimate customers
(synonym) jobber, wholesaler
(hypernym) distributor, distributer
(hyponym) meat packer, packer
2. the performer in the middle of a minstrel line who engages the others in talk
(synonym) interlocutor
(hypernym) minstrel
(member-holonym) minstrel show
3. a person who is in a position to give you special assistance; "he used his business contacts to get an introduction to the governor"
(synonym) contact
(hypernym) representative

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

(n.)
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.
  

(n.)
A person of intermediate rank; a commoner.
  

an independent marketing intermediary; an agent, wholesaler, retailer, etc. See Marketing Channels; Marketing Intermediaries.