rule of decision

Legal Definition of 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 decisionFederal Rules of Evidence Rule 302

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“Rule of decision.” Merriam-Webster.com Legal Dictionary, Merriam-Webster, https://www.merriam-webster.com/legal/rule%20of%20decision. Accessed 20 Sep. 2020.

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