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[pruh-moh-ter] /prəˈmoʊ tər/
a person or thing that promotes, furthers, or encourages.
a person who initiates or takes part in the organizing of a company, development of a project, etc.
a person who organizes and provides financial backing for a sporting event or entertainment.
Chemistry. any substance that in small amounts is capable of increasing the activity of a catalyst.
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.
  1. a site on a DNA molecule at which RNA polymerase binds and initiates transcription.
  2. a gene sequence that activates transcription.
Obsolete. an informer.
Origin of promoter
late Middle English
1400-50; late Middle English; see promote, -er1; replacing earlier promotour < Anglo-French
Related forms
self-promoter, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for promoter
Contemporary Examples
Historical Examples
  • He was many other things, but, to be brief, he was a promoter.

    A Woman Tenderfoot Grace Gallatin Seton-Thompson
  • I suppose nobody, certainly not its promoter, is enamoured of this.

    Another Sheaf John Galsworthy
  • "He was a promoter, just as Jeffrey was," she insisted, with her pretty sulkiness.

    The Prisoner Alice Brown
  • "Take all the time you want," replied the promoter, cheerfully.

    A Woman for Mayor Helen M. Winslow
  • You are a very young man to be the promoter of a project of such magnitude.

    Frank Merriwell's Pursuit Burt L. Standish
British Dictionary definitions for promoter


a person or thing that promotes
a person who helps to organize, develop, or finance an undertaking
a person who organizes and finances a sporting event, esp a boxing match
(chem) a substance added in small amounts to a catalyst to increase its activity
(genetics) a sequence of nucleotides, associated with a structural gene, that must bind with messenger RNA polymerase before transcription can proceed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for promoter

late 14c., "one who promotes" (the interest of someone), "supporter," agent noun from promote, and also from Old French promoteur and directly from Medieval Latin promotor. Specific financial sense of "one who leads in forming a company" is from 1876; sense of "one who organizes sporting or entertainment events" is attested from 1936.

Online Etymology Dictionary, © 2010 Douglas Harper
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promoter in Medicine

promoter pro·mot·er (prə-mō'tər)

  1. A substance that increases the activity of a catalyst.

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

  3. A chemical that may promote carcinogenicity or mutagenicity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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promoter in Science
The region of an operon that acts as the initial binding site for RNA polymerase.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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