Webster's English Dictionary

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accessory

1. ac.ces.so.ry also ac.ces.sa.ry \ik-'ses-(*-)re-, ak-\ n 1a: a thing of 
   secondary or subordinate importance : ADJUNCT  1b: an object or device not 
   essential in itself but adding to the beauty, convenience, or 
   effectiveness of something else 2a: a person not actually or constructively 
   present but contributing as an assistant or instigator to the commission 
   of an offense - called also accessory before the fact 2b: one who knowing 
   that a crime has been committed aids or shelters the of fender with intent 
   to defeat justice - called also accessory after the fact
2. accessory aj 1: aiding or contributing in a secondary way : 
   SUPPLEMENTARY  2: assisting in or contributing to as a subordinate  3: 
   present in a minor amount and not essential as a constituent {an ~  mineral 
   in a rock}