A year is the duration of the motion by which a planet revolves through its orbit. Dig. 40, 7, 4, 5; Calvin.; Bract. 359b.
Definition of Annus Est Mora Motus Quo Suum Planeta Pervolvat Circulum
Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Black's Law Dictionary: 2nd Edition