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QED

1 American  

abbreviation

Physics.
  1. quantum electrodynamics.


Q.E.D. 2 American  

abbreviation

  1. which was to be shown or demonstrated (used especially in mathematical proofs).


QED British  

abbreviation

  1. quod erat demonstrandum

  2. quantum electrodynamics

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Q.E.D.

First recorded in 1810–20, Q.E.D. is from Latin quod erat dēmōnstrandum


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

The attorney general accuses Steen and Fichtenbaum of ”backdoor ties” to QED.

From Seattle Times ● May 24, 2024

If successful, they could confirm QED once more.

From Science Daily ● Nov. 13, 2023

Yusuf Ozdalga, partner at venture capital firm QED Investors, said access to funding and administrative or legal tasks connected with founding a company could also prove tough to navigate for non-Swedish speakers.

From Reuters ● Aug. 11, 2021

He might usefully have concluded his column with the letters we had to put next to solved mathematical equations: QED — quod erat demonstrandum — just to prove his point.

From Washington Post ● Nov. 1, 2019

QED: quod erat demonstrandum, Latin for “which was to be demonstrated or proved.”

From "Charles and Emma: The Darwins' Leap of Faith" by Deborah Heiligman

One of the few New York City comedy clubs blessed with a backyard, Q.E.D., also in Astoria, began hosting live comedy last week on its patio, protecting audience members with abundant health precautions.

From New York Times ● Jul. 2, 2020

“I find it terrifying more than funny,’’ said John Conroy, 35, a stand-up comic who dropped by the Q.E.D.

From Los Angeles Times ● Jun. 8, 2017

We've mentioned the Union's Q.E.D. display of their new attacking trident, and Nyassi's quicksilver plundering behind Houston's back line, but there was also, for example, Marco Pappa's second minute opener for Chicago against Columbus.

From The Guardian ● Jun. 25, 2012

If that's the premise, the rest is Q.E.D.

From Slate ● Aug. 19, 2011

“Then you believe him when he says I never eat. You are a scientist, Dr. Lanning. Think of the logic required. I have not been observed to eat, therefore, I never eat Q.E.D. After all!”

From "I, Robot" by Isaac Asimov

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