Definition of casus belli noun from the Oxford Advanced Learner's Dictionary


casus belli

BrE BrE//ˌkeɪsəs ˈbelaɪ//
; NAmE NAmE//ˌkeɪsəs ˈbelaɪ//
; BrE BrE//ˌkɑːsʊs ˈbeliː//
; NAmE NAmE//ˌkɑːsʊs ˈbeliː//
(pl. casus belli) (formal)
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an act or situation that is used to justify a war Word OriginLatin, from casus ‘fall’ and belli, genitive of bellum ‘war’.
See the Oxford Advanced American Dictionary entry: casus belli