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:
In a typical cavity QED setup, each atom has a ground state and an excited state separated by a specific energy difference.
From Science Daily ● Jun. 6, 2026
The attorney general accuses Steen and Fichtenbaum of ”backdoor ties” to QED.
From Seattle Times ● May 24, 2024
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
“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
Celebrate Star Wars Day with a screening of the original theatrical release version of “Star Wars” at Q.E.D. in Astoria, Queens.
From New York Times ● May 4, 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
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.
