Definition: In the context of law, a paymastership is a type of appointment in which an individual holds the power to manage and control a company or organization on behalf of another person. The paymaster typically has access to financial records, legal documents, and other information that are not available to the owner of the entity. The term "paymastership" was first introduced by the United States Supreme Court in the case of Kelo v. City of New London, 521 U.S.