a person who stirs up others in order to upset the status quo and further a political, social, or other cause: The boss said he would fire any union agitators.
a machine or device for agitating and mixing.

1730–40; agitate + -or2

agitatorial [aj-i-tuh-tawr-ee-uhl, -tohr-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
agitator (ˈædʒɪˌteɪtə)
1.  a person who agitates for or against a cause, etc
2.  a device, machine, or part used for mixing, shaking, or vibrating a material, usually a fluid

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s, from agitation (q.v.); originally "elected representative of the common soldiers in Cromwell's army," who brought grievances (chiefly over lack of pay) to their officers and Parliament. Political sense is first recorded 1734, and negative overtones began with its
association with Irish patriots such as Daniel O'Connell (1775-1847). Historically, in Amer.Eng., often with outside and referring to people who stir up a supposedly contented class or race.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He is not allowed to be an artist, he must be an agitator.
And he can only be an agitator if he sings particular songs.
Since the agitator is elusive and clever, one never knows who he will turn out
  to be or where he will show his hand.
Even in his gradualist phase he remained an agitator, an egalitarian, and a
  socialist to the end.
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