relating to something that is added but is not essential; "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxilliary to each other"

Annexed or pertaining to some more important thing; accessory; incident; as, a right of way appurtenant to land or buildings.

Something which belongs or appertains to another thing; an appurtenance.

Belonging to.

Rights and duties related to the land itself and not to the particular individuals who may have created them.