From The Collaborative International Dictionary of English v.0.44 [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) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
27 Moby Thesaurus words for "accomplice": a party to, abettor, accessary, accessory, accomplice in crime, ally, assistant, associate, coconspirator, cohort, collaborator, colleague, confederate, conspirator, copartner, cotenant, fellow, fellow conspirator, henchman, partaker, participant, participator, partner, party, shareholder, sharer, socius criminis
From THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993) [devils]:
ACCOMPLICE, noun One associated with another in a crime, having guilty knowledge and complicity, as an attorney who defends a criminal, knowing him guilty. This view of the attorney's position in the matter has not hitherto commanded the assent of attorneys, no one having offered them a fee for assenting.
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Let's see what we can do if we put our heads together.0