›COMMERCEa person or company that buys goods from the company that has produced them and makes a profit by selling them to a store or a user: You can lower the price if you cut out the middleman and buy directly from the factory.
›COMMUNICATIONSa person who communicates or makes arrangements between two people or groups who are unwilling or unable to meet or deal directly with each other: Generally, any unsolicited offer to make money by being a middleman for a transaction for somebody you don't know is fraudulent.