Contingent use
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A use limited to take effect upon the happening of some future contingent event; as where lands are conveyed to the use of A. and B., after a marriage shall be had between them.
2 Bl. Comm. 334; Haywood v. Shreve, 44 N. J. Caw, 94; Jemison v. Blowers, 5 Barb. (N. Y.) 692.