quod erat demonstrandum

/ˈkwɒd ˈɛɹæt ˌdɛmənˈstɹændəm/

phrase

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

OriginLatin quod erat dēmōnstrandum ← Ancient Greek ὅπερ ἔδει δεῖξαι →
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Meanings

phrasequod erat demonstrandum (plural quae erant demonstranda)

plural quae erant demonstranda

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

Origin

  1. Ancient Greekὅπερ ἔδει δεῖξαι“precisely what was required to be proved”
  2. Latinquod erat dēmōnstrandum“that which was to be proved”
  3. Englishquod erat demonstrandum

Borrowed from Latin quod erat dēmōnstrandum (“that which was to be proved”), calqued from Ancient Greek ὅπερ ἔδει δεῖξαι (hóper édei deîxai, “precisely what was required to be proved”).

More words from Latin, Ancient Greek

Full word history & related roots →

Translations

Arabic وَهُوَ الْمَطْلُوبُ إثْبَاتُه
  • وَهُوَ الْمَطْلُوبُ إثْبَاتُه (wahuwa l-maṭlūbu ʔiṯbātuh)Latin phrase
Chinese Mandarin 證明完畢 /证明完毕
  • 證明完畢 /证明完毕 (zhèngmíng wánbì)Latin phrase
Czech což mělo být dokázáno, což bylo dokázat
  • což mělo být dokázánoLatin phrase
  • což bylo dokázatLatin phrase
Dutch hetgeen te bewijzen was
  • hetgeen te bewijzen wasLatin phrase
Esperanto kio estis pruvota
  • kio estis pruvotaLatin phrase
Estonian mida oligi tarvis tõestada
  • mida oligi tarvis tõestadaLatin phrase
Finnish mikä oli todistettava
  • mikä oli todistettavaLatin phrase
French ce qu’il fallait démontrer
  • ce qu’il fallait démontrerLatin phrase
German quod erat demonstrandum, was zu beweisen war
  • quod erat demonstrandumLatin phrase
  • was zu beweisen warLatin phrase
Greek όπερ έδει δείξαι
  • όπερ έδει δείξαι (óper édei deíxai)Latin phrase
Hebrew מה שהיה להוכיח, מה שצריך להוכיח
  • מה שהיה להוכיח (mah shehayah lehokhiach)Latin phrase
  • מה שצריך להוכיחLatin phrase
  • מה שרצינו להוכיחLatin phrase
Hindi इति सिद्धम्
  • इति सिद्धम् (iti siddham)Latin phrase
Hungarian ezt kellett bizonyítani
  • ezt kellett bizonyítaniLatin phrase
Icelandic sem sanna átti, það sem sanna átti
  • sem sanna áttiLatin phrase
  • það sem sanna áttiLatin phrase
Italian come volevasi dimostrare
  • come volevasi dimostrareLatin phrase
Japanese 証明終わり
  • 証明終わり (shōmei owari)Latin phrase
Latin quod erat dēmonstrandum
  • quod erat dēmonstrandumLatin phrase
Polish co było do okazania, co było do udowodnienia
  • co było do okazaniaLatin phrase
  • co było do udowodnieniaLatin phrase
  • czego należało dowieśćLatin phrase
  • co kończy dowódLatin phrase
Portuguese quod erat demonstrandum, como queríamos demonstrar
  • quod erat demonstrandumLatin phrase
  • como queríamos demonstrarLatin phrase
Romanian ceea ce trebuia demonstrat
  • ceea ce trebuia demonstratLatin phrase
Russian что и тре́бовалось доказа́ть
  • что и тре́бовалось доказа́ть (što i trébovalosʹ dokazátʹ)Latin phrase
Slovak čo bolo treba dokázať
  • čo bolo treba dokázaťLatin phrase
Spanish como queríamos demostrar
  • como queríamos demostrarLatin phrase
Swedish vilket skulle bevisas, vilket skulle visas
  • vilket skulle bevisasLatin phrase
  • vilket skulle visasLatin phrase
Thai ซึ่งต้องพิสูจน์
  • ซึ่งต้องพิสูจน์ (sêung tông písòot)Latin phrase
Vietnamese điều phải chứng minh
  • điều phải chứng minhLatin phrase
Cite this entry
APA

quod erat demonstrandum. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/quod%20erat%20demonstrandum

MLA

“quod erat demonstrandum.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/quod%20erat%20demonstrandum. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “quod erat demonstrandum,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/quod%20erat%20demonstrandum.

Source: quod erat demonstrandum on Wiktionary, CC BY-SA 4.0.