MLS. A group of brokers joined together in a marketingorganization for the purpose of pooling their respective listings. In exchange for a potentially larger audience of buyers, the brokers agree to sharecommissions. A MLS allows brokers to show a wider variety of homes to prospective buyers, though the broker will make a lower commission because of the shared arrangement. There can be multiple MLS systems within a country, and are often based on location; for instance, the largest MLS in the United States focuses on the Washington D.C.