Black's Law Dictionary (2nd edition)dictionaries

Officio, Ex, Oath

An oath where-by a person may be obliged to make any pre-sentment of any crime or offense, or to con-fess or accuse himself of any criminal matter or thlng whereby he may be liable to any censure, penalty, os punishment 3 Bl. Comm. 447

Source: Black’s Law Dictionary 2nd Ed (1910)