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n. exemption from penalties, payments or legal requirements, granted by authorities or statutes. Generally there are three types of immunity at law: a) a promise not to prosecute for a crime in exchange for information or testimony in a criminal matter, granted by the prosecutors, a judge, a grand jury or an investigating legislative committee; b) public officials' protection from liability for their decisions (like a city manager or member of a public hospital board); c) governmental (or sovereign) immunity, which protects government agencies from lawsuits unless the government agreed to be sued; d) diplomatic immunity which excuses foreign ambassadors from most U.S. criminal laws.