accessory (Noun) — Clothing that is worn or carried, but not part of your main clothing.
accessory (Noun) — A supplementary component that improves capability.
accessory (Noun) — Someone who helps another person commit a crime.
accessory (Adjective) — Aiding and abetting in a crime. ex. "he was charged with being accessory to the crime"
accessory (Adjective) — Furnishing added support. ex. "an accessory pump"