quod erat demonstrandum

[kwawd e-raht dey-mawn-strahn-doom; English kwod er-uht dem-uhn-stran-duhm]
which was to be shown or demonstrated. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quod erat demonstrandum (ˈkwɒd ˈɛræt ˌdɛmənˈstrændʊm)
QED (at the conclusion of a proof, esp of a theorem in Euclidean geometry) which was to be proved

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Cultural Dictionary
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 American Heritage® 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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