appurtenant (adj.)

c. 1300, "right, privilege or possession subsidiary to a principal one," especially in law, "a right, privilege, or improvement belonging to a property," from Anglo-French apurtenance (12c.), Old French apartenance, apertenance, present participle of apartenir "be related to," from Late Latin appertinere "to pertain to, belong to," from Latin ad "to" (see ad-) + pertinere "belong; be the right of" (see pertain).