plural casus belli
Definition of casus belli
: an event or action that justifies or allegedly justifies a war or conflict
Test Your Vocabulary
Eponyms: Words Named After People
-
- What is the best definition of boycott?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share casus belli
Time Traveler for casus belli
The first known use of casus belli was circa 1841
See more words from the same year