An unintentional act, omission, or error.
Mistakes are categorized as a MISTAKE OF FACT, MISTAKE OF LAW, or mutual mistake. A mistake of fact occurs when a person believes that a condition or event exists when it does not. A mistake of law is made by a person who has knowledge of the correct facts but is wrong about the legal consequences of an act or event. A mutual mistake arises when two or more parties have a shared intention that has been induced by a common misbelief.