Promoter

noun
1.
a person or thing that promotes, furthers, or encourages.
2.
a person who initiates or takes part in the organizing of a company, development of a project, etc.
3.
a person who organizes and provides financial backing for a sporting event or entertainment.
4.
Chemistry. any substance that in small amounts is capable of increasing the activity of a catalyst.
5.
Also called collector. Metallurgy. a water-repellent reagent enhancing the ability of certain ores to float so that they can be extracted by the flotation process.
6.
Genetics.

a site on a DNA molecule at which RNA polymerase binds and initiates transcription.
a gene sequence that activates transcription.

7.
Obsolete. an informer.
noun
1.
a person or thing that promotes
2.
a person who helps to organize, develop, or finance an undertaking
3.
a person who organizes and finances a sporting event, esp a boxing match
4.
(chem) a substance added in small amounts to a catalyst to increase its activity
5.
(genetics) a sequence of nucleotides, associated with a structural gene, that must bind with messenger RNA polymerase before transcription can proceed

promoter pro·mot·er (prə-mō’tər)
n.

A substance that increases the activity of a catalyst.

A DNA molecule to which RNA polymerase binds, initiating the transcription of mRNA.

A chemical that may promote carcinogenicity or mutagenicity.

promoter
(prə-mō’tər)
The region of an operon that acts as the initial binding site for RNA polymerase.