WordReference Random House Learner's Dictionary of American English © 2026
Q.E.D.,  an abbreviation of Latin quod erat demonstrandum:
  1. Mathematicswhich was to be shown or demonstrated (used esp. in mathematical proofs).

WordReference Random House Unabridged Dictionary of American English © 2026
QED, [Physics.]
  1. PhysicsSee quantum electrodynamics. 

Q.E.D., 
  1. Mathematicswhich was to be shown or demonstrated (used esp. in mathematical proofs).
  • Latin quod erat dēmōnstrandum
  • 1810–20

'Q.E.D.' also found in these entries (note: many are not synonyms or translations):
QED

Forum discussions with the word(s) "Q.E.D." in the title:


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