Erie doctrine

noun
\ˈir-ē-\

Legal Definition of Erie doctrine 

: a doctrine that a federal court exercising diversity jurisdiction over a case for which no federal law is relevant must apply the law of the state in which it is sitting

called also Erie Rule

— see also Erie Railroad Co. v. Tompkins

History and Etymology for Erie doctrine

from the Supreme Court case Erie Railroad Co. v. Tompkins, which resulted in definition of the doctrine

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