Definition of "accessory"

accessory¹

/əkˈsɛsəɹi/

adjective
comparative more accessory, superlative most accessory
1. Having a secondary, supplementary or subordinate function by accompanying as a subordinate; aiding in a secondary way; being additional; contributing or being contributory.
2. (law) Assisting a crime without actually participating in committing the crime itself; being connected as an incident or subordinate to a principal.
3. Present in a minor amount, and not essential.

accessory²

/əkˈsɛsəɹi/

noun
plural accessories
1. Something that belongs to part of another main thing; something additional and subordinate, an attachment.
  Quotations
  the aspect and accessories of a den of banditti
  1851, Thomas Carlyle, The Life of John Sterling, London: Chapman and Hall, […]
2. (fashion) An article that completes one's basic outfit, such as a scarf or gloves.
  Quotations
  One of the first of a wave of American women contemporary designers who emerged in the 1990s, she [Kate Spade] built a brand on the appeal of clothes and accessories that made shoppers smile.
  2018 June 5, Jonah Engel Bromwich, Vanessa Friedman, Matthew Schneier, “Kate Spade, whose handbags carried women into adulthood, is dead at 55”, in The New York Times‎, New York, N.Y.: The New York Times Company, archived from the original on 6 June 2018
3. (law) A person who is not present at a crime, but contributes to it as an assistant or instigator.
  Quotations
  “You can be an accessory before the fact, or an accessory after the fact. It doesnʼt matter if itʼs before or after; either way youʼd be in for it.”
  2005, Jennifer Worth, Shadows of the Workhouse, Weidenfeld & Nicholson (2009), page 150
4. (art) Something in a work of art without being indispensably necessary, for example solely ornamental parts.