One's legal interest in property—either freehold or non-freehold—is known as?

The correct answer is "Estate." In real estate terminology, an estate refers to the legal interest or claim that an individual has in a property. This interest can be classified as either a freehold estate, which implies an ownership interest with indefinite duration, or a non-freehold estate, which represents a leasehold interest and typically has a definite duration.

Understanding the concept of an estate is crucial as it defines the rights and responsibilities associated with property ownership or use. For instance, a freehold estate grants complete ownership rights, while a non-freehold estate delineates the terms under which one can occupy and use the property but does not confer ownership.

While "Title" can often be used interchangeably in everyday language, in legal contexts, it specifically refers to the legal right to own and use the property, not the broader spectrum of interests that an estate encompasses. "Property" is a general term that refers to the physical parcel itself, and "Tenancy" usually pertains to the relationship between a tenant and a landlord, focusing specifically on the occupancy terms rather than the broader legal interest in the property.