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casus belli

[ key-suhs bel-ahy, bel-ee; Latin kah-soos bel-lee ]
/ ˈkeɪ səs ˈbɛl aɪ, ˈbɛl i; Latin ˈkɑ sʊs ˈbɛl li /
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noun, plural ca·sus bel·li [key-suhs 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.
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Origin of casus belli

1840–50; <New Latin: literally, occurrence of war

Words nearby casus belli

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use casus belli in a sentence

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
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