n. 1.  Something associated with another, more important thing; an accessory. See Synonyms at  attachment. 2.   appurtenances Equipment, such as clothing, tools, or instruments, used for a specific purpose or task; gear. 3.  Law   A right, privilege, or property that is considered incident to the principal property for purposes such as passage of title, conveyance, or inheritance. [Middle English appurtenaunce, from Anglo-Norman apurtenance, from Vulgar Latin *appertinentia, from Late Latin appertinēns, appertinent-, present participle of appertinēre, to appertain; see  APPERTAIN.] ap·purte·nant adj.  | 
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