noun UK /əkˈses.ər.i/ US /əkˈses.ər.i/
（1）C1 [ C usually plural ] something added to a machine or to clothing that has a useful or decorative purpose
She wore a green wool suit with matching accessories (= shoes, hat, bag, etc.).
Sunglasses are much more than a fashion accessory.
Accessories for the top-of-the-range car include leather upholstery, electric windows, and a sunroof.
（2）[ C ] someone who helps another person to commit a crime but does not take part in it
an accessory to murder
★ accessory after the fact specialized
someone who helps someone after that person has committed a crime, for example by hiding them from the police
★ accessory before the fact specialized
someone who helps in the preparation of a crime