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See also: Q.E.D.



Etymology 1[edit]

From q(uantum) e(lectro)d(ynamics).[1]


QED (uncountable)

  1. (physics) (Partial) initialism of quantum electrodynamics.
    • 1980 January, W. B. Atwood, “Lepton Nucleon Scattering”, in Ann Mosher, editor, Proceedings of Summer Institute on Particle Physics: July 9–20, 1979: Quantum Chromodynamics (SLAC Report), Springfield, Va.: National Technical Information Service, U.S. Department of Commerce, →OCLC, part I (Lectures), section 3.1 (The General Scheme), page 26, column 1:
      QCD is a theory of quark interactions much analogous to QED: the interaction is carried by "gluons" (analogous to photons) which couple to the "color" (analogous to charge) of the quarks.
    • 2006, A[nthony] Zee, “Introduction to the 2006 Edition”, in Richard P[hillips] Feynman, QED: The Strange Theory of Light and Matter (Princeton Science Library), Princeton, N.J.; Woodstock, Oxfordshire: Princeton University Press, →ISBN, page xii:
      By the way, these days QED is considered a relatively simple example of a quantum field theory.
    • 2011, Brian Cox; Jeff Forshaw, “Interaction”, in The Quantum Universe: Everything that Can Happen Does Happen, London: Allen Lane, →ISBN, page 176:
      QED is the theory that explains how electrically charged particles, like electrons, interact with each other and with particles of light (photons). [...] Pretty much everything else – certainly everything you see and feel around you – is explained at the deepest known level by QED. Matter, light, electricity and magnetism – it is all QED.
    • 2015, Abdus Salam, “Quantum Electrodynamics”, in David L. Andrews, editor, Photonics: Scientific Foundations, Technology and Applications: Fundamentals of Photonics and Physics, volume I, Hoboken, N.J.: John Wiley & Sons, →ISBN, section 8.10 (Resonance Energy Transfer), page 271:
      Finally, there is still plenty of room to employ and apply QED theory for predictive purposes, by proposing new phenomena, especially within the realm of photonics, thereby ensuring QED remains relevant to current and future generations of researchers working in chemical physics.
    • 2018, James Everitt, “The Aim and Approach”, in A Wave Theory of Universal Resonance: The Physical Basis of Quantum Electro-dynamics in the Cohesive Mechanics of a Unitary Universal Field, volume 1, [Munich, Bavaria]: GRIN Verlag, →ISBN, page 12:
      The aim of this work is essentially twofold: to establish the conception and thus model of a 'unitary universal cohesive field' from 'first principles' within which existing theories, primarily QED and the foundation of its approach, may be understood both in principle and therefore from any abstruse mathematical perspective extrapolated from it; [...]
Derived terms[edit]
  • qQED (quenched quantum electrodynamics)
Related terms[edit]

Etymology 2[edit]

See Q.E.D.



  1. Alternative form of Q.E.D. (initialism of quod erat demonstrandum)


  1. ^ QED, n.2”, in OED Online Paid subscription required, Oxford, Oxfordshire: Oxford University Press, December 2007; “QED, abbrev.”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

Further reading[edit]



Latin Wikipedia has an article on:
Wikipedia la



  1. QED (quod erat demonstrandum) Initialism of quod erat demonstrandum.


  • English: QED (quod erat demonstrandum)



Borrowed from Latin QED.



  1. (sciences) QED
    Synonym: CQD