Which term describes a defined legal property access or use right?

The term that describes a defined legal property access or use right is an easement. An easement allows a person or entity to use a portion of someone else's property for a specific purpose, such as for utility lines, pathways, or access roads, without transferring ownership. This legal right ensures that the holder can use the specified part of the property while respecting the overall ownership rights of the landowner.

Frontage refers to the extent of property that directly borders a road or other access point, but it does not encapsulate the concept of legal access rights as easements do. A grantor is someone who transfers an interest in property, typically in the context of a deed, which is not related to the access rights described by easements. Surveys involve measuring and mapping property boundaries and do not define access rights. Hence, easement is the correct term that captures the essence of a defined legal right to access or use another's property.