What is the term for the right to acquire the estate upon its termination as a life estate?

The term that describes the right to acquire the estate after its termination as a life estate is "future interests." When a life estate comes to an end, typically upon the death of the life tenant, the property will pass to someone else. This right to inherit or possess the property in the future is categorized as a future interest.

Future interests are distinct from present interests, which refer to rights that are currently held, such as a life tenant’s right to use and enjoy the property during their lifetime. Remainder interest specifically refers to a type of future interest that is designed to take effect after the life estate concludes. While a remainder interest is indeed a type of future interest, the broader term encompasses various forms of interests expected to be executed after another interest ends. The life tenant's interest is limited to the duration of their life, which does not extend beyond their lifetime. Therefore, the accurate term to describe the right to obtain the estate after a life estate terminates is future interests, making it the most appropriate choice in this scenario.