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1 : being or having the characteristics of an act or duty prescribed by law as part of the duties of an administrative office
2 : relating to or being an act done after ascertaining the existence of a specified state of facts in obedience to legal and esp. statutory mandate without exercise of personal judgment or discretion see also mandamus compare discretionary
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.