A broker is someone who buys or sells for someone else for a commission. You may go to a real estate company to get a broker to help you buy a house.

In Middle English broker meant "peddler or retailer." Nowadays a broker still sells things — but she's acting as an agent making deals for someone else and collecting a commission for all that work. Used as a verb, broker means to arrange a deal or negotiate. Working for an advisory firm, a broker may convince you to invest in a company — so the broker would broker a business deal.

Definitions of broker
  1. noun
    a businessman who buys or sells for another in exchange for a commission
    synonyms: agent, factor
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    an agent who conducts an auction
    general agent, insurance agent, insurance broker, underwriter
    an agent who sells insurance
    investment banker, underwriter
    a banker who deals chiefly in underwriting new securities
    estate agent, house agent, land agent, real estate agent, real estate broker
    a person who is authorized to act as an agent for the sale of land
    ship broker
    an agent for the ship owner; obtains cargo and may arrange for its loading or discharge
    an agent in the buying and selling of stocks and bonds
    one appointed to represent a city or university or corporation in business transactions
    travel agent
    someone who sells or arranges trips or tours for customers
    killer bee
    an investment banker who devises strategies to make a target company less attractive for takeover
    a real estate agent who is a member of the National Association of Realtors
    type of:
    bourgeois, businessperson
    a capitalist who engages in industrial commercial enterprise
  2. verb
    act as a broker
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    type of:
    negociate, negotiate, talk terms
    discuss the terms of an arrangement
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