Cesser, proviso for
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Where terms for years are raised by settlement, it is usual to introduce a proviso that they shall cease when the trusts end. This proviso generally expresses three events: (1) The trusts never arising; (2) their becoming unnecessary or incapable of taking effect; (3) the performance of them.
Sugd. Vend. (14th Ed.) 621-623.