<p><strong>Noun</strong></p><ul><li>a person or thing that promotes, furthers, or encourages.</li><li>a person who initiates or takes part in the organizing of a company, development of a project, etc.</li><li>a person who organizes and provides financial backing for a sporting event or entertainment.</li><li>Chemistry: any substance that in small amounts is capable of increasing the activity of a catalyst.</li><li>Also called collector.</li><li>Metallurgy: a water-repellent reagent enhancing the ability of certain ores to float so that they can be extracted by the flotation process.</li><li>Genetics: a site on a DNA molecule at which RNA polymerase binds and initiates transcription.</li><li>a gene sequence that activates transcription.</li><li>Obsolete: an informer.</li></ul>