q.e.d.
/ˌkjuˌiˈdi/
Word Rarity
Very rare
Frequency: Zipf frequency 1.83 in modern English
13
Scrabble Score
3
Letters
1
Syllables
3
Unique Chars
Meaning
phrase
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.
Dated
phrase
Used to indicate that an argument or proposition is proved by the existence of some fact or scenario.
noun
A certain fact or scenario that proves an argument or proposition; a justification.
phrase
Alternative letter-case form of Q.E.D..
Example Sentences
- "[A]fter the same manner S and U are proved to be equal, therefore the square of CB is equal to the square of the 2 other sides Q E D."
- "Now let any right line meet four harmonicals in A, C, B, D, and if those harmonicals be parallel, the thing is evident; but, if they intersect in V, draw ECF parallel to VD, the line most remote from C; then, by the first part, EC#61;CF, and AD#58;AC#58;#58;VD#58;EC or CF. Therefore AD#58;AC#58;#58;BD#58;CB. q. e. d."
- "By Cases 1 and 2, we see that any finite collection of 4k-1 primes cannot contain all such primes. Thus there are infinitely many primes of this type. ¶ Q.E.D."
- "That this part of the world has actually been peopled (Q. E. D.) to support which, we have living proofs in the numerous tribes of Indians that inhabit it."
- "PROP[OSITION] VI. One substance cannot be produced by another substance. ¶ Demonst[ration]. In the preceding proposition we have seen that there cannot in the nature of things be two Substances of the same attribute, or that they have anything in common (by Prop. II.); and so (by Prop. III.) one cannot be the cause of, or be produced by, another: q. e. d."
- "Of all those on the market, Eastman's is the only one with a solution tight, locking cover. ¶ Q. E. D."
Etymology
Origin
- Source language: Latin
Word Breakdown
Regional Pronunciation
- American English: /ˌkjuˌiˈdi/
- British English: /ˌkjuːiːˈdiː/