See more synonyms for promoter on
  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.
    1. a site on a DNA molecule at which RNA polymerase binds and initiates transcription.
    2. a gene sequence that activates transcription.
  7. Obsolete. an informer.

Origin of promoter

1400–50; late Middle English; see promote, -er1; replacing earlier promotour < Anglo-French
Related formsself-pro·mot·er, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for promoter

Contemporary Examples of promoter

Historical Examples of promoter

  • 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.

British Dictionary definitions for promoter


  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
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

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

promoter in Medicine


  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.

promoter in Science


  1. The region of an operon that acts as the initial binding site for RNA polymerase.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.