Join In
Twitter
YouTube
Weekly Newsletter
Libraries
A-Z Grammatical Terms
A-Z Confused Words
FAQs by Writers
A-Z Awkward Plurals
Punctuation Lessons
Common Mistakes
(ordered by seriousness) ESL Vocabulary Lists Parts of Speech Lists A-Z Idioms and Proverbs Tests and Games Top Tip Install a grammar checker
for your browser
(ordered by seriousness) ESL Vocabulary Lists Parts of Speech Lists A-Z Idioms and Proverbs Tests and Games Top Tip Install a grammar checker
for your browser
"q.e.d. (quod erat demonstrandum)" (Latin)
What does the Latin term q.e.d. (quod erat demonstrandum) mean?
"Q.E.D." is an abbreviation derived from the Latin phrase "quod erat demonstrandum," which translates to "which was to be demonstrated" in English. It is used at the end of a proof or argument to signify that the desired outcome or conclusion has been successfully demonstrated or proven. It serves as a concise way to indicate the completion of a logical argument or mathematical proof.Examples in Sentences
Here are three example sentences:- After a series of rigorous mathematical calculations, the equation simplifies to 2x + 5 = 13. Solving for x yields x = 4. Q.E.D.
- The scientific experiment yielded consistent results across multiple trials, supporting the hypothesis that A leads to B. Q.E.D.
- By analyzing historical data and conducting statistical tests, the researchers conclusively demonstrated a correlation between smoking and lung cancer incidence. Q.E.D.
Previous and Next Terms
Test Your Knowledge of Latin Terms
Ready for the Test?
More Latin Terms
Help Us Improve Grammar Monster
- Do you disagree with something on this page?
- Did you spot a typo?
Find Us Quicker!
- When using a search engine (e.g., Google, Bing), you will find Grammar Monster quicker if you add #gm to your search term.
Next lesson >
Technical Help
Download Grammarly's free browser extension. It helps with:
Avoiding spelling errors
Correcting grammar errors
Finding better words
Self Help
Buy the Grammar Monster book.
Suitable for: Teachers, advanced students, and business writers.
Description: Published by London's Octopus Publishing, "Smashing Grammar" is the third, and most comprehensive, grammar reference book written by Craig Shrives (the founder of the Grammar-Monster.com). It is divided into three sections:
Description: Published by London's Octopus Publishing, "Smashing Grammar" is the third, and most comprehensive, grammar reference book written by Craig Shrives (the founder of the Grammar-Monster.com). It is divided into three sections:
- A-Z Grammar Glossary (This section explains grammar terminology, from the basics to advanced terms. It is especially useful because every entry concludes with a valuable and succinct explanation of why the grammar term matters for a writer.)
- A-Z of Punctuation (Packed with entertaining examples, this section provides definitive, well-explained rules for using all the principal punctuation marks. Punctuation should not be guesswork. There are rules.)
- A-Z of Easily Confused Words (This section covers all the homonyms and near homonyms that plague writers and offers tips on how to remember which to use.)
Next lesson >