contingency

noun

1. (uncountable)The quality of being contingent, of happening by chance.
2. (countable)A possibility; something which may or may not happen. A chance occurrence, especially in finance, unexpected expenses.

   “There was also the imperative necessity of creating a reserve fund for unforeseen contingencies, and the question ever present was how was money to be found.”

   “In light of the inherent survival threat posed by zombies and absent specified guidance for detailed planning to address such a contingency, USSTRATCOM has taken the initiative to develop a JOPES Level 3 plan (CONPLAN) consistent with guidance derived from other specified planning efforts to ensure U.S. and Allied freedom of action from zombie domination.”

3. (countable)An amount of money which a party to a contract has to pay to the other party (usually the supplier of a major project to the client) if they do not fulfill the contract according to the specification.
4. (countable)A statement which is neither a tautology nor a contradiction.