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copartner(Business associate), noun adjuvant, auxiliary, coadjutant, cohelper, collaborator, colleague, comate, companion, compeer, confrère, consort, cooperator, coworker, fellow, fellow worker, helper, mate, partner, peer, personnel, sharer
copartner(Coconspirator), noun abettor, accessory, accessory after the fact, accessory before the fact, accomplice, accomplice in crime, adjunct, adjutant, adjuvant, aid, aide-de-camp, aider and abettor, associate, attendant, camarade, coadjutant, coadjutor, coadjutress, cohort, collaborator, colluder, comate, companion, comrade, confederate, confrère, consociate, conspirer, cooperator, copartner in crime, helper, helpmate, intrigant, intriguer, machinator, particeps criminis, partner in crime, socius criminis, supporter
Associated concepts: joint adventure, joint enterprise, tenant in copartnership
See also: accessory, assistant, associate, coactor, consociate, consort, contributor, member, participant, partisan, partner
COPARTNER. One who is a partner with one or more other persons; a member of a partnership.