Meaning of “accessory” - Learner’s Dictionary

accessory

noun [ C ] uk us /əkˈsesəri/
EXTRA

something extra that is not necessary but is attractive or useful:

[ usually plural ] They sell belts and scarves and other fashion accessories.
computer accessories
CRIME formal

someone who helps a criminal to commit a crime:

an accessory to murder

(Definition of “accessory” from the Cambridge Learner’s Dictionary © Cambridge University Press)