Accessory

• clothing that is worn or carried, but not part of your main clothing
• accessary: aiding and abetting in a crime; "he was charged with being accessory to the crime"
• a supplementary component that improves capability
• someone who helps another person commit a crime
• furnishing added support; "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxiliary to each other"
• 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.
• A second building on a lot and one that is not considered to be the primary building, eg a storage shed or a parking space. Usually described as 'Accessory Building' or 'Accessory Unit'.
• An item or service selected on an order designed for use with a base item.
• An extra building component added to a building such as a door, window, vent, etc.