from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One that mediates, especially one that reconciles differences between disputants.
  • noun Physiology A substance or structure that mediates a specific response in a bodily tissue.
  • noun Physics A subatomic particle that effects or conveys a force between subatomic particles.

from The Century Dictionary.

  • noun One who mediates; one who interposes between parties; especially, one who interposes for the purpose of effecting reconciliation.
  • noun A go-between; an agent.
  • noun Synonyms Intercessor, interceder, propitiator.

from the GNU version of the Collaborative International Dictionary of English.

  • noun One who mediates; especially, one who interposes between parties at variance for the purpose of reconciling them; hence, an intercessor.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One who negotiates between parties seeking mutual agreement

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a negotiator who acts as a link between parties


from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin mediātor ("one who mediates"), from mediātum, supine of mediō ("be in the middle"), from medius ("middle").


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