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]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "brokerage":
   admission, admission fee, agency, anchorage, barter, bartering,
   boiler room, brokerage house, brokerage office, bucket shop,
   buying and selling, carfare, cellarage, charge, charges,
   cover charge, dealing, demand, dockage, doing business, dues,
   entrance fee, exaction, exactment, exchange, fare, fee,
   give-and-take, hire, horse trading, interchange, jobbing,
   legal bucketing, license fee, merchandising, pilotage, portage,
   retailing, salvage, scot, scot and lot, shot, stockbrokerage,
   stockbroking, stockjobbery, stockjobbing, storage, swapping, toll,
   towage, trade, trading, trafficking, wharfage,
   wheeling and dealing, wholesaling



Bouvier's Law Dictionary, Revised 6th Ed (1856):

BROKERAGE, contracts. The trade or occupation of a broker; the commissions
paid to a broker for his services.