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• QED
  QED

  abbreviation

  quantum electrodynamics.
• Q.E.D.
  Q.E.D.

  abbreviation

  which was to be shown or demonstrated (used especially in mathematical proofs).

QED

¹ American  

abbreviation

Physics.

1. quantum electrodynamics.

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Q.E.D. ² American  

abbreviation

1. which was to be shown or demonstrated (used especially in mathematical proofs).

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QED British  

abbreviation

1. quod erat demonstrandum

2. quantum electrodynamics

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Etymology

Origin of Q.E.D.

First recorded in 1810–20, Q.E.D. is from Latin quod erat dēmōnstrandum

Example Sentences

They supposed that Galatia was a slip of the pen for Gallia, and argued, if to Gallia, then to Vienne, the most ancient and important city therein, q.e.d.

From In Troubadour-Land A Ramble in Provence and Languedoc by Baring-Gould, S. (Sabine)

Therefore, q.e.d., it was commendable to palm that base coin upon him.

From Romantic Spain A Record of Personal Experiences (Vol. I) by O'Shea, John Augustus