Definition of casus belli noun from the Oxford Advanced American Dictionary

 

casus belli

 noun
noun
NAmE//ˌkɑsəs ˈbɛli//
 
, NAmE//ˌkeɪsəs ˈbɛlaɪ//
 
(pl. casus belli)(formal)
 
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an act or situation that is used to justify a war
See the Oxford Advanced Learner's Dictionary entry: casus belli