accessory

1 something that is not necessary in itself but adds to the convenience or performance of the main piece of equipment bought a new car with lots of high-tech accessories Synonyms accoutrement (or accouterment), adapter (also adaptor), add-on, adjunct, appendage, appliance, attachment, option Related Words accompaniment, additive, complement, supplement; auxiliary, subsidiary; amenity, doodad, embroidery, extra, filler, frill, incidental, luxury, nonessential, nonnecessity; appurtenances, bells and whistles, equipment, furnishings, habiliment(s), paraphernalia, trappings; adornment, decoration, embellishment, enhancement, garnish, ornament, trim, trimming Near Antonyms essential, necessity, requirement, requisite

2 one associated with another in wrongdoing two accessories, the driver of the getaway car and the dishonest bank teller, were charged in the robbery case Synonyms abettor (also abetter), accomplice (also accessary), cohort, confederateRelated Words collaborationist, collaborator, informant, informer; evidence, state's evidence; companion, comrade, crony, henchman, partner; conspirator, plotter, traitor; gangster, mobster, racketeer