Noun
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someone who helps another person commit a crime
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a supplementary component that improves capability
- add on -
clothing that is worn or carried, but not part of your main clothing
Adjective
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furnishing added support
"an ancillary pump"
"an adjuvant discipline to forms of mysticism"
"The mind and emotions are auxiliary to each other"
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aiding and abetting in a crime
"he was charged with being accessory to the crime"