S: (n) computer accessory (an accessory for a computer) "when you add in all the computer accessories you are going to need the computer gets pretty expensive"
S: (n) fitting (a small and often standardized accessory to a larger system)
S: (n) fixings, trimmings (the accessories that normally accompany (something or some activity)) "an elaborate formal dinner with all the fixings"; "he bought a Christmas tree and trimmings to decorate it"
S: (n) component, constituent, element (an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system) "spare components for cars"; "a component or constituent element of a system"