GNU Collaborative International Dictionary of English

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Found one definition

1.       
   collaborator (?), n. [L. collaborare to labor together; col- + laborare to labor: cf. F. collaborateur.]
   1. An associate in labor, especially in literary or scientific labor.
   
   [1913 Webster]
   
   
   2. one who willingly cooperates with an enemy, especially an enemy nation occupying one's own country.
   
   [PJC]