cui bono

cui bo·​no | \ ˈkwē-ˈbō-(ˌ)nō How to pronounce cui bono (audio) \

Definition of cui bono

1 : a principle that probable responsibility for an act or event lies with one having something to gain
2 : usefulness or utility as a principle in estimating the value of an act or policy

First Known Use of cui bono

1604, in the meaning defined at sense 1

History and Etymology for cui bono

Latin, to whose advantage?

Keep scrolling for more

Learn More about cui bono

Time Traveler for cui bono

Time Traveler

The first known use of cui bono was in 1604

See more words from the same year

Statistics for cui bono

Cite this Entry

“Cui bono.” Dictionary, Merriam-Webster, Accessed 26 Feb. 2020.

More from Merriam-Webster on cui bono

Rhyming Dictionary: Words that rhyme with cui bono

Comments on cui bono

What made you want to look up cui bono? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!