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q.e.d.

Today it means: Used to indicate that an argument or proposition is proved by the existence of some fact or scenario. Full definition →

Late Latin QED ← Latin quod erat demonstrandum

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The story

Latin · derived fromquod erat demonstrandum
Late Latin · derived fromQED
English todayQ.E.D.

From Late Latin QED, from Latin quod erat demonstrandum.

Words from the same roots

Latinquod erat demonstrandum all →

quod erat demonstrandum

Etymology from Wiktionary, CC BY-SA 4.0.