Definition from Wiktionary, the free dictionary
Alternative forms 
- (noun): accessary
- IPA: /æk.ˈsɛs.ɚ.rɪ/
Etymology 1 
- First attested in 1550's.
- From Middle English accessorie Medieval Latin accessōrius, from Latin accessor (“helper, subordinate”), from Latin accessus.
- Compare English access, from same root.
- Having a secondary, supplementary or subordinate function by accompanying as a subordinate; aiding in a secondary way; being additional; being connected as an incident or subordinate to a principal; contributing or being contributory. Said of persons and things, and, when of persons, usually in a bad sense; as, he was accessory to the riot; accessory sounds in music.
- (law) Assisting a crime without actually participating in committing the crime itself.
- Present in a minor amount, and not essential.
- (having a secondary function): accompanying, contributory, auxiliary, subsidiary, subservient, additional, acceding
Derived terms 
having a supplementary function
assisting a crime
Etymology 2 
- (legal): First attested in 1414.
- (fashion): First attested in 1896.
accessory (plural accessories)
- That which belongs to something else deemed the principal; something additional and subordinate, an attachment.
- the accessories of a mobile phone
- (fashion) An article that completes one's basic outfit, such as a scarf or gloves.
- (law) One who, not being present, contributes as an assistant or instigator to the commission of an offense; One who assists after the commission of a crime, but was not present.
- (art) Anything that enters into a work of art without being indispensably necessary, as mere ornamental parts.
Derived terms 
that which belongs to something else deemed the principal, attachment
contributor to an offense
unessential part in a work of art
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