noun “broker”
 singular broker, plural brokers
- a person who buys and sells assets such as stocks, bonds, or real estate for others 
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 She consulted a broker to invest her savings in the stock market.
 - a person who arranges transactions between a buyer and a seller; a mediator or middleman 
As a broker, he facilitated the sale of the company.
 - a person who mediates between parties to reach an agreement 
The diplomat acted as a broker in the peace negotiations.
 - (in computing) an agent or software that mediates communication or transactions 
The message broker ensures data is transferred smoothly between services.
 
verb “broker”
 infinitive broker; he brokers; past tense brokered; past part. brokered; ger. brokering
- to arrange or negotiate (a deal or agreement between parties) 
The diplomat brokered a ceasefire between the warring factions.
 - to act as a broker; to mediate in a sale or transaction 
She brokers in commercial real estate.