unity
unity, n. 1. The fact or condition of being one in number; oneness. 2. At common law, a requirement for the creation of a joint tenancy. • The four unities are interest, possession, time, and title. See joint tenancy under TENANCY. [Cases: Joint Tenancy 1, 3. C.J.S. Estates § 19; Joint Tenancy§§ 2, 4, 6–15, […]