mediator

Etymology

It is inherited from Middle English mediatour,^[2][3][4] either borrowed from Anglo-Norman mediatur, also mediatour, and mediateur,^[5][4][6] or from their source, borrowed from Latin mediātor (“one who mediates”),^[5][3][2] formed from medius (“middle”) and the suffix -ātor.^[5] Etymonline derives it from the Late Latin verb mediō (“to intervene; to divide in the middle”),^[3] which the OED notes is recorded slightly later than the noun;^[5] the Latin adjective goes back to Proto-Indo-European *médʰyos (“middle”).^[3] Although the Latin noun occurs once in Apuleius, most of its early examples are Christian, translating Ancient Greek μεσίτης (mesítēs, “go-between”), which the New Testament uses of Christ as the intermediary between God and man.^[5][7] The Anglo-Norman noun is recorded from 1267 for a negotiator or intermediary.^[8] It is related to mediate, medium and median.^[9]

Earliest recorded meaning

In theology, an intermediary between God and humankind, especially Christ: about 1384, in the early version of the Wycliffite Bible.^[5][2] Etymonline dates the word to the mid-14th century, first applied to Christ,^[3] and Weekley to about 1300.^[9]

Semantic evolution

The secular sense followed at once: Chaucer used the word in the Parson's Tale (about 1390) for a go-between or messenger, a sense obsolete by 1697.^[5][10] From about 1410 it meant a person who intervenes between two parties to reconcile them or bring about an agreement.^[5][3] The Middle English Dictionary also records it for a saint or the Virgin Mary as an intercessor.^[2] Johnson (1755) gave both "one that intervenes between two parties" and "an intercessor".^[11] From the 15th century it could be anything that effects a transition between two stages,^[5] and the 20th century added scientific senses: a chemical substance such as a hormone or enzyme that acts as an intermediary in a process (1956), and in particle physics a particle that carries a force (1968).^[5] The feminine mediatrix, first of the Virgin Mary, dates from about 1400.^[3]

Timeline

• c. 1384 – in theology, an intermediary between God and humankind, Christ.^[5][2]
• c. 1390 – a go-between, messenger (obsolete by 1697).^[5]
• c. 1410 – a person who intervenes to reconcile two parties.^[5]
• c. 1475 – an intermediate agent; something that effects a transition.^[5]
• 1902 – in cards, a variation of ombre and quadrille.^[5]
• 1956 – in physiology and chemistry, a substance acting as an intermediary.^[5]
• 1968 – in particle physics, a carrier of a force.^[5]

Meanings

Noun

1. A person who works with the parties to a dispute to help them reach an agreement: The union and the employers agreed to call in a mediator.^[6][5]
2. An intercessor; in Christian theology, Christ as the intermediary between God and humankind.^[6][5]
3. Something that passes on or brings about an effect; in physiology, a substance such as a hormone or enzyme that acts in a chemical process.^[6][5]
4. (obsolete) A go-between or messenger.^[5][2]

Word family

• mediatorship

Related words

• median
• mediate
• mediation
• mediatorial
• mediatrix
• medium
• mid

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
3. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
5. ^ a b c d e f g h i j k l m n o p q r s t u Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
6. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
8. ^ Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
9. ^ a b Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
10. ^ Benson, Larry D., Glossarial Concordance to Middle English (Chaucer, Gower), Johns Hopkins University, github.com/jhu-digital-manuscripts/gcme
11. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.