appurtenant

furnishing added support; "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxiliary to each other"

बिजली की कटौती की दशा में हमारे पास एक सहायक जनरेटर होना चाहिये.

The action mechanism of a key consists of the key itself and all its appurtenances.