Pro Majori Cautela
Defined in 2 dictionaries — Cyclopedic (1922), Black's (1910)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
For greater caution. never written. Ambl. 139. Pro non scriptis, as void. 7 Wils. & S. 523. PRO OPERE ET LABORE (Law Lat.) For work and labor.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
For greater caution; by way of additional security. Usually applied to some act done or some clause inserted in an instrument, which may not be really necessary, but which will serve to put the matter beyond any question.