which was to be shown or demonstrated (used especially in mathematical proofs).
Why Does The Letter Q Almost Always Need The Letter U?Scrabble players are acutely aware that Q is a tricky letter. To use a Q in the game, a player must also find an available U. The fact that Q is the second most rarely used letter in the alphabet certainly doesn’t make using Q any easier.
Why Are A, E, I, O, U, And Y Called “Vowels”?In elementary school, we all learned the vowels of the English language: A, E, I, O, U and sometimes Y. But, what makes a vowel a vowel?
Origin of Q.E.D.
First recorded in 1810–20, Q.E.D. is from the Latin word quod erat dēmōnstrandum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
1760, abbreviation of Latin quod erat demonstrandum "which was to be demonstrated."
Online Etymology Dictionary, © 2010 Douglas Harper