Search Result for "casus belli":
Wordnet 3.0

NOUN (1)

1. an event used to justify starting a war;

The Collaborative International Dictionary of English v.0.48:

Casus \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. [1913 Webster] 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. [1913 Webster]
WordNet (r) 3.0 (2006):

casus belli n 1: an event used to justify starting a war