Webster's English Dictionary

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broker

bro.ker \'bro--k*r\ n [ME, negotiator, fr. (assumed) AF brocour; akin to OF 
   broche pointe]d tool, tap of a cask 1a: an agent who arranges marriages  
   1b: an agent who negotiates contract of purchase and sale  Brit  2: a 
   dealer in secondhand goods