Webster's English Dictionary

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promoter

pro.mot.er \-'mo-t-*r\ n 1: one that promotes; esp : one who assumes the 
   financial responsib ilities of a sporting event including contracting with 
   the principals, renting the site, and collecting gate receipts obs  2: 
   PROSECUTOR  3: a substance that in very small amounts is able to increase 
   the activity  of a catalyst