QED
abbreviation
QED
1 Americanabbreviation
Physics.
Q.E.D.
2
American
abbreviation
QED
British
abbreviation
-
quod erat demonstrandum
-
quantum electrodynamics
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 team's approach is based on cavity quantum electrodynamics, commonly known as cavity QED.
From Science Daily ● Jun. 6, 2026
The attorney general accuses Steen and Fichtenbaum of ”backdoor ties” to QED.
From Seattle Times ● May 24, 2024
It produced its first commercial MRI machine, QED 80, in 1980.
From Washington Post ● Aug. 18, 2022
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
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
In fact, GameStop started falling after the announcement, Q.E.D.
From Los Angeles Times ● Feb. 1, 2021
For fans who prefer to stay home, Q.E.D. is selling discounted tickets to watch the live shows on Zoom.
From New York Times ● Jul. 2, 2020
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
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
