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mediator

[mee-dee-ey-ter]
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noun
  1. a person who mediates, especially between parties at variance.
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Origin of mediator

1250–1300; < Late Latin (see mediate, -tor); replacing Middle English mediatour < Anglo-French < Late Latin, as above
Related formsme·di·a·tor·ship, nounun·der·me·di·a·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for mediator

n.

mid-14c., from Late Latin mediatorem (nominative mediator) "one who mediates," agent noun from past participle stem of mediari "to intervene, mediate," also "to be or divide in the middle," from Latin medius "in the middle" (see medial (adj.)). Originally applied to Christ, who in Christian theology "mediates" between God and man. Meaning "one who intervenes between two disputing parties" is first attested late 14c. Feminine form mediatrix (originally of the Virgin Mary) from c.1400. Related: Mediatorial; mediatory.

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Online Etymology Dictionary, © 2010 Douglas Harper