[pro.mot.er] n (14c) 1: one that promotes; esp: one who assumes the financial responsibilities of a sporting event (as a boxing match) including contracting with the principals, renting the site, and collecting gate receipts
2. obs: prosecutor
3: a substance that in very small amounts is able to increase the activity of a catalyst
4: a binding site in a DNA chain at which RNA polymerase binds to initiate transcription of messenger RNA by one or more nearby structural genes