-ˈfȯidərə̇s -ˈfed-, -ˈfēd- noun
( plural casus foederis “)
Etymology: New Latin, case of the treaty
: 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