quod erat demonstrandum

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈkwɒd ˈɛræt ˌdɛmənˈstrændʊm/

US:USA pronunciation: respellingUSA pronunciation: respelling(kwôd e′rät dā′môn strän′dŏŏm; Eng. kwod er′ət dem′ən stran′dəm)



WordReference Random House Unabridged Dictionary of American English © 2026
quod e•rat de•mon•stran•dum  (kwôd e′rät dā′môn strän′dŏŏm; Eng. kwod er′ət dem′ən stran′dəm),USA pronunciation [Latin.]
  1. Foreign Termswhich was to be shown or demonstrated.

Collins Concise English Dictionary © HarperCollins Publishers::
quod erat demonstrandum Latin: /ˈkwɒd ˈɛræt ˌdɛmənˈstrændʊm/
  1. (at the conclusion of a proof, esp of a theorem in Euclidean geometry) which was to be provedAbbreviation: QED
'quod erat demonstrandum' also found in these entries (note: many are not synonyms or translations):
QED

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