A person who buys and sells goods or assets for others. The broker helped me purchase shares in the company.
An agent who negotiates contracts of purchase and sale (as of real estate, commodities, or securities). We hired a broker to handle the sale of our house.
A person who arranges or negotiates a settlement, deal, or plan. The peace broker was instrumental in negotiating the ceasefire agreement.
A software component or service that mediates the exchange of information between other software applications or systems. The message broker routes data between microservices.