A ninja was a covert agent or mercenary in feudal Japan who specialized in unorthodox warfare. The functions of the ninja included espionage, sabotage, infiltration, and assassination, and open combat in certain situations.
Usage See Special:Whatlinkshere/Etymology:Ninja for a list of articles using this term. This is an etymology page: a page detailing the origins of terminology used in the series in regards to real world culture and history.