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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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
Accessories are the finishing touches that complete the new silhouette.
But-listen-maybe every political group on every campus should start its own
  line of accessories.
High-end fashion turns out to be more susceptible to downturns than leather
  goods or other accessories.
For more ideas, check out our collection of eco-conscious accessories.
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