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Q.E.D.

1.
which was to be shown or demonstrated (used especially in mathematical proofs).
Origin of Q.E.D.
1810-1820
First recorded in 1810-20, Q.E.D. is from the Latin word quod erat dēmōnstrandum
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for QED
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  • QED” was not intelligible to him, but it sounded very well indeed, he thought.

    For Fortune and Glory Lewis Hough
British Dictionary definitions for QED

QED

abbreviation
1.
quod erat demonstrandum
2.
quantum electrodynamics
Word Origin
(sense 1) Latin: which was to be shown or proved
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
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Word Origin and History for QED

Q.E.D.

1760, abbreviation of Latin quod erat demonstrandum "which was to be demonstrated."

Online Etymology Dictionary, © 2010 Douglas Harper
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