English

Phrase

quod erat demonstrandum (plural quae erant demonstranda)

1. (something) which was to be proved; which was to be demonstrated.

Derived terms

• QED

Translations

Latin

Pronunciation

• (Classical) IPA^(key): /kʷod ˈe.rat deː.monˈstran.dum/, [kʷɔd ˈɛ.rat deː.mõːˈstran.dũ]
• (Ecclesiastical) IPA^(key): /kwod ˈe.rat de.monˈstran.dum/, [kwod ˈeː.rat de.monˈstran.dum]

Etymology

From quod the nominative neuter singular of quī ‎(“that”) and erat ‎(“was”) the third-person singular imperfect active indicative of sum ‎(“I am”) and dēmonstrandum ‎(“thing to be proven”) nominative neuter singular of dēmonstrandus which is the future passive participle of dēmonstrō ‎(“I demonstrate”). Literally meaning "(that) which was to be demonstrated".

Phrase

quod erat dēmonstrandum (plural quae erant dēmonstranda)

1. which was to be proved; which was to be demonstrated.

Derived terms

• q. e. d., Q. E. D., QED

Portuguese

Phrase

quod erat demonstrandum

1. quod erat demonstrandum (which was to be demonstrated)

Synonyms

• QED, CQD