- 1[usually plural] an extra piece of equipment that is useful but not essential, or that can be added to something else as a decoration bicycle accessories a line of furnishings and accessories for the home
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- 2[usually plural] a thing that you can wear or carry that matches your clothes, for example a belt or jewelry fashion accessories to dress up your wardrobe
- 3(law) a person who helps someone to commit a crime or who knows about it, and protects the person from the police an accessory before/after the fact (= before/after the crime was committed) accessory to something He was charged with being an accessory to murder.
Check pronunciation: accessory