What term is used when someone has the legal right to use someone else's property for a specific purpose?

The term that describes having the legal right to use someone else's property for a specific purpose is known as an easement. An easement grants an individual or entity the right to utilize a portion of another person's property for a designated activity, such as accessing a road, maintaining utilities, or using shared driveways. This right is typically documented and is tied to the property rather than to an individual, which means it can remain even if the property changes ownership.

In contrast, a license refers to a permission granted to use another’s property, but it is often revocable and does not create a permanent interest in the property. A lease, while also providing the right to use property, establishes a rental agreement that gives the tenant exclusive possession for a specific period and rent. Title represents ownership of property rather than a specific right to use someone else's property.

Thus, easement is the most accurate term for the situation described in the question, as it specifically pertains to the legal rights to use another's land for a particular purpose.