A renunciation or abandonment by or upon oath. The oath by which any person holding office in England was formerly obliged to bind himself not to acknowledge any right in the Pretender to the throne of England; 1 Bla.Com. 368; 13 and 14 W. III, c. 6, repealed by 30 and 31 Vic. c. 59. It also denotes an oath abjuring certain doctrines of the church of Rome