Trace this noun to the French verb “apartenir,” meaning “to belong to,” from the Latin “appertinere,” which also means “belong to.” The English noun “appurtenance” continues this meaning as it designates objects that belong to a certain category. It’s usually used in the plural, as it covers a range of items — “appurtenances” can refer to specific items or can be used in a general sense to talk about equipment associated with a particular category. In a specific sense, these items are supplemental accessories, such as the appurtenances for a stand mixer. In a general sense, these items can designate a type of activity, such as someone having a garage filled with the appurtenances of motorcycle riding.