casus foederis

noun

casus foe·​de·​ris

-ˈfȯidərə̇s -ˈfed-,

-ˈfēd-

plural casus foederis

"

: a case or event covered by the provisions or stipulations of a treaty or compact

the casus foederis had arisen. When Italy attacked Ethiopia … no one could doubt … that … it had been in breach of the clearest obligations of the Covenant

—Robert Cecil †1958

Word History

Etymology

New Latin, case of the treaty

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