Casus

noun

1. In law, a chance, an accident, or an event: used frequently with other words to express some technical meaning.
2. In commercial law, that which is contemplaced by the parties to a contract, or that which is stipulated for or brought within the terms of the contract.
3. An event; an occurrence; an occasion; a combination of circumstances; a case; an act of God. See the Note under accident.
4. an event or combination of events which is a cause war, or may be alleged as a justification of war.
5. an accident against which due prudence could not have provided. See Act of God, under Act.