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quod erat demonstrandum

[kwawd e-raht dey-mawn-strahn-doo m; English kwod er-uh t dem-uh n-stran-duh m] /kwɔd ˈɛ rɑt ˌdeɪ mɔnˈstrɑn dʊm; English kwɒd ˈɛr ət ˌdɛm ənˈstræn dəm/
Latin.
1.
which was to be shown or demonstrated.

quod erat faciendum

[kwawd e-raht fah-kee-en-doo m; English kwod er-uh t fey-shee-en-duh m] /kwɔd ˈɛ rɑt ˌfɑ kiˈɛn dʊm; English kwɒd ˈɛr ət ˌfeɪ ʃiˈɛn dəm/
Latin.
1.
which was to be done.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for erat

quod erat demonstrandum

/ˈkwɒd ˈɛræt ˌdɛmənˈstrændʊm/
uknown
1.
(at the conclusion of a proof, esp of a theorem in Euclidean geometry) which was to be proved QED
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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erat in Culture
quod erat demonstrandum (Q.E.D.) [(kwawd er-aht dem-uhn-stran-duhm)]

A phrase used to signal that a proof has just been completed. From Latin, meaning “that which was to be demonstrated.”

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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