Which term describes a life estate characterized by ownership lasting only for the duration of someone else's lifetime?

The term that accurately describes a life estate lasting for the duration of someone else's lifetime is a life estate pur autre vie. This type of life estate is specifically designed so that the ownership rights are based on the lifetime of a person other than the life tenant. When the person whose life governs the duration of the estate passes away, the rights to the property will revert to the original owner or their heirs, or pass to another specified party, as outlined in the estate agreement.

In contrast, a fee simple absolute grants the owner full control and ownership of the property indefinitely, without any conditions. Tenancy at will is a rental arrangement that can be terminated at any time by either party, and it does not convey ownership rights over an estate. Joint tenancy involves co-ownership where all tenants have equal rights to the property, including the right of survivorship, which is distinctly different from a life estate pur autre vie. Each of these terms has specific implications in property law, making a life estate pur autre vie unique in its association with the duration of another person's life.