noun · phrase · 4 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ˌkjuːiːˈdiː/
Received-Pronunciation:Recorded audio is listed in the source snapshot.
General-American:/ˌkjuˌiˈdi/
1
noun
Meaning 1
A certain fact or scenario that proves an argument or proposition; a justification.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
phrase
Meaning 2
Initialism of quod erat demonstrandum (“what was 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.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, dated, initialism
Topics: mathematics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
phrase
Meaning 3
Used to indicate that an argument or proposition is proved by the existence of some fact or scenario.
Definition source: English Wiktionary via Wiktextract
Usage: broadly
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
phrase
Meaning 4
Alternative letter-case form of Q.E.D..
Definition source: English Wiktionary via Wiktextract
Usage: alt-of
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
History
Etymology
From Late Latin QED, from Latin quod erat demonstrandum.
Across languages
Translations
30 source translations are retained for this English entry.
Aramaic:
קמ׳׳ל
(qa mashma' lan)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Chinese Mandarin:
證畢 /证毕
(zhèngbì)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Chinese Mandarin:
證訖 /证讫
(zhèngqì)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Chinese Mandarin:
得證 /得证
(dézhèng)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Czech:
c.b.d.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Esperanto:
KEP
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Estonian:
MOTT
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Finnish:
MOT
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
French:
CQFD
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Georgian:
რ.დ.გ
(r.d.g)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
German:
w. z. b. w.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
German:
h.x.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Greek:
Ό.Έ.Δ.
(Ó.É.D.)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Hebrew:
מָשָׁ״ל
(masha"l)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Hebrew:
מ.ש.ל.
(m.sh.l.)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Hindi:
इ. सि.
(i. si.)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Icelandic:
þ.s.s.á.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Italian:
CVD
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Polish:
c.b.d.o.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Polish:
c.b.d.u.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Polish:
cnd.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Polish:
ckd.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Portuguese:
CQD
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Portuguese:
QED
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Russian:
ч. т. д.
(č. t. d.)
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Slovak:
Č.B.T.D.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Spanish:
C.Q.D.
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Swedish:
VSV
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Swedish:
VSB
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
Vietnamese:
đpcm
— ''initialism placed at the end of a mathematical proof to show that the theorem under discussion is proved''
