- caseAn actual event, situation, or fact.
- casualtySomething that happens by chance, especially an unfortunate event; an accident, a disaster.
- casuistA person who resolves cases of conscience or moral duty.
- casuisticsSynonym of casuistry, particularly in its neutral sense.
- casus belliAn act seen as justifying or causing a war; an act of war.
- casus foederisA situation covered by the terms of an international treaty (or similar understanding), and which consequently requires action from the parties involved.