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a person or thing that promotes something, in particular. a person or company that finances or organizes a sporting event or theatrical production:a boxing promoter a person involved in setting up and funding a new company. a supporter of a cause or aim:Mitterrand was a fierce promoter of European integration (also promotor) Chemistry an additive that increases the activity of a catalyst. Biology a region of a DNA molecule that forms the site at which transcription of a gene starts.