- noun a useful piece of equipment, added to others
- noun a small item of clothing
- noun a person who helps someone commit a crime
- A device which is not essential for the proper operation of another, but that adds functionality to it.
- A device that adds functionality to a computer. Usually synonymous with peripheral (1).
- noun a person who helps or advises someone who commits a crime
- noun something which helps something else to happen or operate, but may not be very important in itself