Contingent estate
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
An estate which depends for its effect upon an event which may or may not happen; as an estate limited to a person not in esse, or not yet bom.
2 Crabb, Real Prop. p. 4, § 946; Haywood v. Shreve, 44 N. J. Law, 94; Wadsworth v. Murray, 29 App. Div. 191, 51 N. Y. Supp. 1038; Thornton v. Zea, 22 Tex. Civ. App. 509, 55 S. W. 798; Hopkins v. Hopkins, 1 Hun, 354.