ac ‧ ces ‧ so ‧ ry /əkˈsesəri/ BrE AmE noun ( plural accessories ) [countable]
1 . [usually plural] something such as a piece of equipment or a decoration that is not necessary, but that makes a machine, car, room etc more useful or more attractive:
bathroom accessories such as mirrors and towel-rails
2 . [usually plural] something such as a bag, belt, or jewellery that you wear or carry because it is attractive:
fashion accessories
a set of fully matching clothes and accessories
3 . someone who helps a criminal, especially by helping them hide from the police
accessory to
an accessory to murder
an accessory before/after the fact (=someone who helps a criminal before or after the crime)