Joint tenancy: Ownership of property by two or more people with a right of survivorship. If one owner dies, his share passes to the surviving owners so that, eventually, the entire property is held by one person. A valid joint tenancy requires the four unities: unity of interest (each joint tenant must have an identical interest, including equality of duration and extent), unity of title (the interests must arise from the same document), unity of possession (each joint tenant must have an equal right to occupy the entire property) and unity of time (the interests must have arisen at the same time). Married couples and trustees are frequently joint tenants. (Contrast with tenancy-in-common.)
