casus belli

[ key-suh s bel-ahy, bel-ee; Latin kah-soo s bel-lee ]
/ ˈkeɪ səs ˈbɛl aɪ, ˈbɛl i; Latin ˈkɑ sʊs ˈbɛl li /

noun, plural ca·sus bel·li [key-suh s bel-ahy, bel-ee; Latin kah-soos bel-lee] /ˈkeɪ səs ˈbɛl aɪ, ˈbɛl i; Latin ˈkɑ sus ˈbɛl li/.

an event or political occurrence that brings about a declaration of war.

QUIZZES

CHALLENGE YOURSELF WITH THIS MIDDLE SCHOOL PART OF SPEECH QUIZ!

How well do you know your adjectives from your adverbs? Your preposition from your pronouns? Your interjections from your conjunctions? Let’s put your knowledge of parts of speech to the text! Note: Many of the following questions will ask you to identify the parts of speech “in order.” That means the first word in all capital letters will correspond to the first option in an answer, and so on.
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In order, what parts of speech are the words in all capital letters? Alisa was VERY tired, SO she decided to go to bed.

Origin of casus belli

1840–50; < New Latin: literally, occurrence of war
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for casus belli

casus belli
/ Latin (ˈkɑːsʊs ˈbɛliː) /

noun plural casus belli (ˈkɑːsʊs ˈbɛliː)

an event or act used to justify a war
the immediate cause of a quarrel

Word Origin for casus belli

literally: occasion of war
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012