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Rule Of Decision
rule of decision
:something (as a law, rule of law, body of law, or prior decision) that governs a decision or adjudication [a claim or defense as to which State law supplies the rule of decision "Federal Rules of Evidence Rule 302"]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.