Word.ws English Dictionary

QED

/ˌkjuːiːˈdiː/US/ˌkjuˌiˈdi/

QED noun: (Partial) initialism of quantum electrodynamics. Also the alternative form of Q.E.D..

Noun

QED (uncountable)

  1. (Partial) initialism of quantum electrodynamics.
    • 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.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)...
    • By the way, these days QED is considered a relatively simple example of a quantum field theory.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...

Also used as

QED is also the alternative form of Q.E.D..

Examples of QED in a sentence

  • Matter, light, electricity and magnetism – it is all QED.2011, Brian Cox, Jeff Forshaw, “Interaction”, in The Quantum Universe: Everything that Can Happen Does Happen, London: Allen Lane, →ISBN...
  • Although his own early work on QED helped bring photons and electrons into a consistent framework, Dr.2020 February 28, George Johnson, “Freeman Dyson, Math Genius Turned Technological Visionary, Dies at 96”, in The New York Times, →ISSN:

Origin of QED

From q(uantum) e(lectro)d(ynamics).

See Q.E.D.

Words formed from QED

Questions about QED

What does QED mean?
QED means (Partial) initialism of quantum electrodynamics.
How do you use QED in a sentence?
Matter, light, electricity and magnetism – it is all QED.
What part of speech is QED?
QED is a noun.
How do you pronounce QED?
QED is pronounced /ˌkjuːiːˈdiː/ (UK).

Words near QED in the dictionary

  1. QDs
  2. QE
  3. QE2
  4. QEC
  5. QECs
  6. QED
  7. Qedarite
  8. Qedarites
  9. qedoshim
  10. QEDs
  11. qeej

Source and license

Adapted from Wiktionary: QED (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: En-uk-QED.oga.

Cite this entry: “QED.” Word.ws, https://word.ws/qed. Based on Wiktionary, CC BY-SA 4.0.