In Being
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In existenco or life at a given moment of time, as, in the phrase "Ilfe or lives in being" in the rule against perpetuities. An unbarn child may, in some circumstances be considered as "in being."
Phillips v. Herron, 55 Ohio St. 478, 45 N. E. 720; Hone v. Van Schaick, 3 Barb. Chi (N. Y.) 509.