In Primis
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
(Law Lat.) In the first place. Mag. Cart. Johan. c.
1.
IN PRINCiPIO (Lat. at the beginning). This is frequently used in citations; as, Bac. Abr. "Legacies in pr."