noun, plural accessories.
a subordinate or supplementary part, object, or the like, used mainly for convenience, attractiveness, safety, etc., as a spotlight on an automobile or a lens cover on a camera.
an article or set of articles of dress, as gloves, earrings, or a scarf, that adds completeness, convenience, attractiveness, etc., to one's basic outfit.
Also called accessory before the fact. a person who, though not present during the commission of a felony, is guilty of having aided and abetted another, who committed the felony.
Also called accessory after the fact. a person who knowingly conceals or assists another who has committed a felony. Compare principal ( def 9b ).
Anatomy, accessory nerve.
contributing to a general effect; supplementary; subsidiary.
Law. giving aid as an accessory.
Petrography. (of a mineral) being present in small amounts in a rock and having no bearing on the classification of the rock, as zircon in granite.

1400–50; late Middle English accessorie (< Middle French) < Medieval Latin accessōrius. See accede, -tory1

accessorily, adverb
accessoriness, noun
interaccessory, adjective
nonaccessory, adjective, noun, plural nonaccessories.

1. See addition. 3. accomplice. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
accessory (əkˈsɛsərɪ)
n , pl -ries
1.  a supplementary part or object, as of a car, appliance, etc
2.  (often plural) a small accompanying item of dress, esp of women's dress
3.  a person who incites someone to commit a crime or assists the perpetrator of a crime, either before or during its commission
4.  supplementary; additional; subordinate
5.  assisting in or having knowledge of an act, esp a crime
[C17: from Late Latin accessōrius: see access]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

also accessary (n.), early 15c. as a legal term in the criminal sense of "one aiding in a crime;" adj. meaning "aiding in crime" is from c.1600; both from L.L. accessorius, from accessor, agent noun from accedere (see access). Attested from 1896 as "woman's smaller articles
of dress," hence accessorize (1939).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

accessory ac·ces·so·ry (āk-sěs'ə-rē)

  1. Having a secondary, supplementary, or subordinate function.

  2. Of, relating to, or being a body part, such as a gland, nerve, or muscle, that is anatomically auxiliary.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Success rate will vary depending on location of accessory pathway and number of
  accessory pathways.
To make things worse, many people have come to regard dogs as something more
  than a furry household accessory.
Gaffer's tape is an essential photographic accessory.
The collapsible boat was touted as a necessary accessory for the traveler and
  the camper.
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