One of the mysteries of the English language finally explained.
A person who resolves or settles matters or controversies; a decider, judge, or arbiter. In later use (Judaism): a rabbi who decides matters in Jewish religious law.
Mid 16th century; earliest use found in Richard Grafton (c1511–1573), printer and historian. From post-classical Latin decisor arbiter from classical Latin dēcīs-, past participial stem of dēcīdere + -or.
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