The Collaborative International Dictionary of English v.0.48:

Brokerage \Bro"ker*age\, n.
   1. The business or employment of a broker. --Burke.
      [1913 Webster]

   2. The fee, reward, or commission, given or changed for
      transacting business as a broker.
      [1913 Webster]

WordNet (r) 3.0 (2006):

brokerage
    n 1: a stock broker's business; charges a fee to act as
         intermediary between buyer and seller [syn: brokerage,
         brokerage firm, securities firm]
    2: the business of a broker; charges a fee to arrange a contract
       between two parties
    3: place where a broker conducts his business [syn: brokerage
       house, brokerage]