Wiktionary:Word of the day/2020/January 24

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Q.E.D. phrase

(mathematics, dated) Initialism of quod erat demonstrandum (“what had to be proved; what was to be demonstrated”): placed at the end of a mathematical proof to show that the theorem under discussion is proved. (by extension) Used to indicate that an argument or proposition is proved by the existence of some fact or scenario. Q.E.D. n Some fact or scenario that proves an argument or proposition; a justification. Today is marked by the United Nations as the International Day of Education to recognize the importance of ensuring equitable and inclusive education at all levels so that people may acquire the knowledge and skills needed to participate fully in society and contribute towards sustainable development.

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