Definition of "confederate"

He found some of his confederates in gaol.

1849–1861, Thomas Babington Macaulay, chapter 21, in The History of England from the Accession of James the Second, volumes (please specify |volume=I to V), London: Longman, Brown, Green, and Longmans

So how do you win the imitation game? “Just be yourself,” a past confederate advises Christian. But what does it mean to “be yourself”?

2011 March 18, David Leavitt, “I Took the Turing Test”, in The New York Times‎

All the swords / In Italy, and her confederate arms, / Could not have made this peace.

c. 1608–1609 (date written), William Shakespeare, “The Tragedy of Coriolanus”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene iii]

All persons who conspire confederate and agree to murder any person whether a subject of Her Majesty or not and whether within the Queen's dominions or not, […] shall be guilty of a misdemeanour, and shall be liable to imprisonment for a term of not more than ten years.

1958, Parliament of Victoria, “Part I, Division 1, section 4”, in Crimes Act 1958‎, page 806