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n. 1) an error in comprehending facts, meaning of words or the law, which causes one party or both parties to enter into a contract without understanding the obligations or results. Such a mistake can entitle one party or both parties to a rescission (cancellation) of the contract. A mistaken understanding of the law (as distinguished from facts) by one party only is usually no basis for rescission since "ignorance of the law is no excuse." 2) an error discovered to be incorrect at a later time.