'Vis major' definitions:

Definition of 'vis major'

(from WordNet)
noun
A natural and unavoidable catastrophe that interrupts the expected course of events; "he discovered that his house was not insured against acts of God" [syn: act of God, force majeure, vis major, inevitable accident, unavoidable casualty]

Definition of 'Vis major'

From: GCIDE
  • Vis major \Vis ma"jor\ [L. major greater.] (Law) A superior force which under certain circumstances is held to exempt from contract obligations; inevitable accident; -- a civil-law term used as nearly equivalent to, but broader than, the common-law term act of God (which see). [Webster 1913 Suppl.]