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BNC: 37504 COCA: 0
QED
abbreviation /ˌkjuː iː ˈdiː/
  1. used for saying that a particular fact proves that what you have said is true 证毕;证讫
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    Written abbreviations: abbreviation, acronym, anon....
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Word story
From the Latin expression quod erat demonstrandum meaning ‘which was to be proved'.
BNC: 37504 COCA: 0
BNC: 37504 COCA: 0

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