QED

abbr. quod erat demonstrandum.

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noun

a relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons

• Syn: ↑quantum electrodynamics

• Hypernyms: ↑quantum field theory

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abbreviation

Etymology: Latin quod erat demonstrandum

which was to be demonstrated

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Physics.

See quantum electrodynamics.

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abbrev

1. Quantum electrodynamics

2. Quod erat demonstrandum (Latin), which was to be demonstrated (or proved; also q.e.d.)

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QED UK [ˌkjuː iː ˈdiː] US [ˌkju i ˈdi] abbreviation

Etymology

From the Latin expression quod erat demonstrandum meaning ‘which was to be proved’.

used for saying that a particular fact proves that what you have said is true

Thesaurus: written abbreviations_hyponym ways of emphasizing that something is true or exact_synonym determiners_hyponym

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Q.E.D. or QED¹ (no periods),

which was to be proved (Latin, quod erat demonstrandum): »

The layman…may find it possible to believe that Euclid—or possibly Newton—wrote a concluding QED, to indicate the end of a complete collection of all mathematics (New Scientist).

QED² (no periods),

quantum electrodynamics.

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abbr.

■ quantum electrodynamics

■ quod erat demonstrandum

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/ˌkjuːˌiːˈdiː/ abbr

— used to say that something (such as a particular fact or a logical statement) proves what you were trying to prove

◇ QED is an abbreviation of the Latin phrase “quod erat demonstrandum,” /ˌkwɑːdˈeɚˌɑːtˌdɛmənˈstrændəm/ which means “which was to be demonstrated.”

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QED [QED] (BrE) (also Q.E.D. US, BrE) [ˌkjuː iː ˈdiː] [ˌkjuː iː ˈdiː] abbreviation

that is what I wanted to prove and I have proved it (from Latin ‘quod erat demonstrandum ’)