Magistrate

google

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late Middle English: from Latin magistratus ‘administrator’, from magister ‘master’.

wiktionary

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From Latin magistratus.

etymonline

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magistrate (n.)

late 14c., "a civil officer in charge of administering laws," also "office or function of a magistrate," from Old French magistrat, from Latin magistratus "a magistrate, public functionary," originally "magisterial rank or office," from magistrare "serve as a magistrate," from magister "chief, director" (see master (n.)). From late 17c. often meaning "justice of the peace" or other minor officials having criminal jurisdiction.