Thesaurus

(adj) : having a secondary, supplementary or subordinate function by accompanying as a subordinate; aiding in a secondary way; being additional; being connected as an incident or subordinate to a principal; contributing or being contributory. Said of persons and things, and, when of persons, usually in a bad sense; as, he was accessory to the riot; accessory sounds in music; Assisting a crime without actually participating in committing the crime itself

(n) : that which belongs to something else deemed the principal; something additional and subordinate, an attachment; an article that completes one's basic outfit, such as a scarf or gloves