In civil and old English law. An apostate; a deserter from the faith; one who has renounced the Christian faith. Cod. 1, 7; Reg. Orig. 716. Apostata capiendo. An obsolete English writ which issued against an apostate, or one who had violated the rules of his religious order. It was addressed to the sheriff, and commanded him to deliver the defendant into the custody of the abbot or prior. Reg. Orig. 71, 267; Jacob; Wharton. APOSTILLE, Appostille. L. Fr. An addition; a marginal note or observation. Kelham.