Appurtenance

n. right associated with ownership of property; accessory

Appurtenances (from late Latin appertinentia, from appertinere, "to appertain") is a legal term for what belongs to and goes with something else, the accessories or things usually conjoined with the substantive matter in question.
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Noun
1. a supplementary component that improves capability
(synonym) accessory, supplement, add-on
(hypernym) component, constituent, element
(hyponym) auto accessory
(derivation) pertain, appertain

(n.)
That which belongs to something else; an adjunct; an appendage; an accessory; something annexed to another thing more worthy; in common parlance and legal acceptation, something belonging to another thing as principal, and which passes as incident to it, as a right of way, or other easement to land; a right of common to pasture, an outhouse, barn, garden, or orchard, to a house or messuage. In a strict legal sense, land can never pass as an appurtenance to land.
  

Something that, although detached, stands as part of another thing. - (read more on Appurtenance)