Etymology
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appurtenance (n.)

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).

updated on January 31, 2017

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Definitions of appurtenance from WordNet

appurtenance (n.)
equipment consisting of miscellaneous articles needed for a particular operation or sport etc.;
Synonyms: gear / paraphernalia
appurtenance (n.)
a supplementary component that improves capability;
Synonyms: accessory / supplement / add-on
From wordnet.princeton.edu, not affiliated with etymonline.