Definition of "accomplice"

accomplice

/əˈkɒm.plɪs/

noun
plural accomplices
1. (law) An associate in the commission of a crime; a participator in an offense, whether a principal or an accessory.
  Quotations
  And thou, the curst accomplice of her treason, Declare thy message, and expect thy doom
  1749, Samuel Johnson, Irene
  suspected for accomplice to the fire
  1693, Decimus Junius Juvenalis, John Dryden, transl., “[The Satires of Decimus Junius Juvenalis.] The Third Satyr”, in The Satires of Decimus Junius Juvenalis. Translated into English Verse. […] Together with the Satires of Aulus Persius Flaccus. […], London: Printed for Jacob Tonson […]
2. (rare) A cooperator.
  Quotations
  Success unto our valiant general, And happiness to his accomplices!
  1591 (date written), William Shakespeare, “The First Part of Henry the Sixt”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene ii]