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.

which was to be shown or demonstrated.

Definition for erat (2 of 2)

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.

which was to be done.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for erat

British Dictionary definitions for erat

quod erat demonstrandum

/ Latin (ˈkwɒd ˈɛræt ˌdɛmənˈstrændʊm) /

(at the conclusion of a proof, esp of a theorem in Euclidean geometry) which was to be provedAbbreviation: 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

Culture definitions for erat

quod erat demonstrandum

[ (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 Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.