Ca"sus (?), n. [L.]
An event; an occurrence; an occasion; a combination of circumstances; a case; an act of God. See the Note under Accident.
Casus belli, an event or combination of events which is a cause war, or may be alleged as a justification of war. -- Casus fortuitus, an accident against which due prudence could not have provided. See Act of God, under Act. -- Casus omissus, a case not provided for by the statute.
© Webster 1913.