Force Majeure
A French term literally translated as "greater force", this clause is included in contracts to remove liability for natural and unavoidable catastrophes that interrupt the expected course of events and restrict participants from fulfilling obligations.
Investopedia Commentary
This clause is meant to benefit both parties in a contract. Force majeure would come into play, for example, when you buy a house: should the house be destroyed in a fire caused by a lightning strike, neither party remains obligated.
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See also: Act of God Bond, Catastrophe Bond - CAT, Drought Sale, Hazard Insurance