From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. A cooperator. [R.]
Note: It is followed by with or of before a person and by in (or sometimes of) before the crime; as, A was an accomplice with B in the murder of C. Dryden uses it with to before a thing. "Suspected for accomplice to the fire." --Dryden.
From WordNet (r) 3.0 (2006) [wn]:
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