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English definition of “accessory”

accessory

noun [C usually plural] (EXTRA)    /əkˈses.ər.i/ US  /-ɚ-/
C1 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.Things added or attached to other things
(Definition of accessory noun (EXTRA) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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