accomplice
ac·comp·lice
noun
1.
a person who joins with another in carrying out some plan (especially an unethical or illegal plan)
Origin
First attested in 1550. From a complice, from Middle English complice, from Old French complice (“confederate”), from Latin complicāre (“fold together”). The article a became part of the word, through the influence of the word accomplish.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.