Expectant right
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A contingent right, not vested; one which depends on the continued existence of the present condition of things until the happening of some future event. Pearsall v. Great Northern RCo...
161 U. S. 646 , 16 Sup. Ct. 705, 40 1. Ed. 838.
Expectation of life
in the doctrine of life annuities, is the share or number of years of life which a person of a given age may, upon an equality of chance, expect to enjoy.
Wharton.