Supplying added support or relating to something that is added to or belongs to something else; such as, in situations like a building addition that fits, or belongs to the original structure; or a legal decision about whether a claim of discrimination is appurtenant to a particular law: "The contractor was about to build in the appurtenant parts of the building including the doors, windows, ventilators, partitions, electrical connections, etc."

"Janice was told by her physician that physical health results in appurtenant mental well-being."