q. e. d.

A form of q.e.d. — Used to indicate that an argument or proposition is proved by the existence of some fact or scenario.

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Meanings

q. e. d.1

phrase
  1. Alternative letter-case form of Q.E.D..
noun
  1. Alternative letter-case form of Q.E.D..

Q. E. D.2

phrase
  1. alternativeAlternative form of Q.E.D. (“initialism of quod erat demonstrandum”).

    Ergo, Reuben Butler might take possession of the parish of Knocktarlitie, without forfeiting his friendship or favour—Q. E. D.

    1818 July 25, Jedediah Cleishbotham [pseudonym; Walter Scott], chapter VI, in Tales of My Landlord, Second Series, […] (The Heart of Mid-Lothian), volume IV, Edinburgh: […] [James Ballantyne and Co.] for Archibald Constable and Company, →OCLC, page 120
    3 more examples

    If death, ſaid my father, reaſoning with himſelf, is nothing but the ſeparation of the ſoul from the body;—and if it is true that people can walk about and do their buſineſs without brains,—then certes the ſoul does not inhabit there. Q. E. D.

    1759, [Laurence Sterne], chapter XIX, in The Life and Opinions of Tristram Shandy, Gentleman, 2nd (1st London) edition, volume II, London: […] R[obert] and J[ames] Dodsley […], published 1760, →OCLC, page 168

    Theorem 2. The Angles B, C, at the Baſe of an Iſoceles Triangle ABC, are equal to each other; and a Line AD biſecting the Angle BAC, divides the Baſe into two equal Parts, and is perpendicular thereto. For becauſe the Line AD biſects the #92;angleA, that is, makes the #92;angleBAD#61;#92;angleCAD, and Side AB is #61;AC, and AD common to both, the #92;triangleABD#61;#92;triangleACD; #92;angleB#61;#92;angleC, and #92;angleADB#61;#92;angleADC; #92;becauseAD#92;perp to BC. Q. E. D.

    1775, Benjamin Donn, “An Essay on Plane Geometry”, in The Geometrician: Containing Essays on Plane Geometry, and Trigonometry: […], 2nd edition, London: Sold by J[oseph] Johnson, […], →OCLC, book I (The Introduction), paragraph 59, page 10

    [I]f the Son [of God] be in nature equal to the Father, he is also equal in Godhead, which is a word expressing nature; and if equal in Godhead, equally God supreme. Q. E. D.

    1823, Daniel Waterland, “A Second Defence of Some Queries Relating to Dr. Clarke’s Scheme of the Holy Trinity: In Answer to the Country Clergyman’s Reply”, in The Works of the Rev. Daniel Waterland, D.D. […], volume III, Oxford, Oxfordshire: At the Clarendon Press, →OCLC, query III, page 165
noun
  1. alternativeAlternative form of Q.E.D. (“some fact or scenario that proves an argument or proposition”).

    This was exactly the Q. E. D. of the paper.

    1814 February, G. D. Yeats, “Account of Ann Fooks’s Case of Ischuria and Vomiting of Urine”, in Samuel Fothergill, John Want, editors, The Medical and Physical Journal, volume XXXI, part 2, number 180, London: Published for the proprietors, by J. Adlard, […]; and sold by J. Souter, […], →OCLC, page 122
    2 more examples

    The Unitarian might therefore here easily produce his Q. E. D. for the exclusion of all but the maintainers of Christ's proper humanity from the pale of Christianity.

    1825, William Magee, “Supplement to the Remarks on the Unitarian Version of the New Testament”, in Discourses and Dissertations on the Scriptural Doctrines of Atonement & Sacrifice; […], volume II, Philadelphia, Pa.: S. Potter & Co. […]; Jesper Harding, printer, →OCLC, footnote, page 266

    Whoever starts a doubt as to the validity of any of those allegations to which he has set his Q. E. D. is indicted as a disturber of the peace.

    1827, “Anglicanus” [pseudonym], “Letter III”, in View of the Character, Position, and Prospects, of the Edinburgh Bible Society. In Seven Letters, Edinburgh: Printed for Brown & Wardlaw, […]; and sold by M. Ogle, […], →OCLC, page 24
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APA

q. e. d.. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/q.%20e.%20d.

MLA

“q. e. d..” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/q.%20e.%20d.. Accessed November 5, 2026.

Chicago

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Source: q. e. d. on Wiktionary, CC BY-SA 4.0.