a person who takes part in a conspiracy; plotter.

1375–1425; late Middle English conspiratour < Anglo-French < Medieval Latin; see conspire, -tor

nonconspirator, noun
preconspirator, noun

traitor, schemer, conniver. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1413, conspyratour, from Fr. conspirateur, from L. conspiratorem, noun of action from conspirare (see conspire). Fem. form conspiratress is from mid-18c. Related: Conspiratorial (1855); conspiratorially (1912); conspiratory (adj., 1801).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Not to neglect our colleagues and co-conspirators on the project: the geophysics team.
He was convicted solely on the testimony of co-conspirators who were now cooperating with the government.
Nine other co-conspirators have been charged to date.
Another chilling reminder are the prison hoods and shackles worn by the
  imprisoned conspirators.
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