1. An individual or firm that charges a free or commission for executing buy and sell orders submitted by an investor.
2. The role of firm when it acts as an agent for a customer and charges the customer a commission for its services.
3. A licensed real estate professional who typically represents the seller of a property. A broker's duties may include: determining market values, advertising propersties fora sale, showing properties to propertive buyers, and advising clients whith regard to offers and related matters.