QED
abbreviation
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QED
1 Americanabbreviation
Physics.
Q.E.D.
2
American
abbreviation
QED
British
abbreviation
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quod erat demonstrandum
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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.
A limitation of many cavity QED systems is that all of the atoms interact with the light in exactly the same way.
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
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.
