Definition of QED abbreviation from the Oxford Advanced Learner's Dictionary

 

QED

 abbreviation
(also Q.E.D. US English, British English)abbreviation
BrE BrE//ˌkjuː iː ˈdiː//
 
; NAmE NAmE//ˌkjuː iː ˈdiː//
 
 
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that is what I wanted to prove and I have proved it (from Latin quod erat demonstrandum)
See the Oxford Advanced American Dictionary entry: QED