Q.E.D.

Formally used at the end of mathematical proofs to indicate their completion, informally to indicate an argument has been won. Literally "Which was to be demonstrated" (not just "which was demonstrated").
... Yeah well, I checked; they don't make dildos that big. Q.E.D.
by CletusInteruptus April 30, 2008
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Q.E.D.

A word used by intellectuals that, apparently, they are quite sensitive about if you translate incorrectly. Causes redness and itching on mathemeticians when misused.
Bert- "Q.E.D. means "quit earning dough." It's what you do when you decide to become a professor, right?

Professor Hubert, PHD- "I hate you, I hate you, I hate you!"
by Doctor Feltgood May 15, 2008
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Q.E.D.

Certainly an abbreviation of quod erat demonstrandum but after watching, suffering through, proving thousands of proofs, a math major might just say Quite Easily Done.
The final line of many proofs of the Pythagorean Theorem.

a squared + b squared = c squared

Q.E.D.
by MoHare April 30, 2008
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Q.E.D.

Abbreviation of Latin 'Quod Erat Demonstrandum' meaning 'Which was to be demonstrated'. When doing your geometry exam at St Custard's, you might be required to prove that the square on the hypotenuse is equal to the square on the other two sides. When you think you have given the required proof, you put at the end Q.E.D. In other words. 'That's what you asked me to prove, and I've proved it.'
You asked me to prove the existence of God. God is defined as self-existing, that is, not caused. Everything that exists must be the effect of a cause but the first cause of all other effects cannot by definition be the result of a previous cause. That first cause is therefore God. Q.E.D.
by richelxxx April 30, 2008
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Q.E.D.

Abbreviation of Latin 'Quod Erat Demonstrandum' meaning 'Which was to be demonstrated'. When doing your geometry exam at St Custard's, you might be required to prove that the square on the hypotenuse is equal to the square on the other two sides. When you think you have given the required proof, you put at the end Q.E.D. In other words. 'That's what you asked me to prove, and I've proved it.'
You asked me to prove the existence of God. God is defined as self-existing, that is, not caused. Everything that exists must be the effect of a cause but the first cause of all other effects cannot by definition be the result of a previous cause. That first cause is therefore God. Q.E.D.
by richelxxx May 1, 2008
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Q.E.D

guy1:see that hot bitch over there, i would so do her

guy2:i wouldn't

guy1:OMG u must be gay.. LOLOLOL ur gay..

guy2:no bitch, she's ma sister.. Q.E.D
by Mr Hobo August 21, 2009
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Q.E.D.

QED is quantum Electro dynamics. Originally discovered by Richard Feynman. QED is the theory of electrodynamics. To simplify, it shows how light and matter interact
Feynman won a nobel peace prize for discovering Q.E.D.
by Quantum Electro Dynamics December 18, 2015
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