1. adjective /əkˈsɛsərɪ/
a) 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.
b) Assisting a crime without actually participating in committing the crime itself.
2. noun /əkˈsɛsərɪ/
a) That which belongs to something else deemed the principal; something additional and subordinate, an attachment.
the accessories of a mobile phone
b) An article that completes ones basic outfit, such as a scarf or gloves.
The aspect and accessories of a den of banditti.
Wikipedia foundation.