Jisho

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Noun
1. ninja; person trained in ninjutsu and employed for covert purposes in feudal JapanHistorical term, See also 忍術
Wikipedia definition
2. NinjaA ninja or shinobi 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. Their covert methods of waging war contrasted the ninja with the samurai, who observed strict rules about honor and combat.
Read “Ninja” on English Wikipedia
Read “忍者” on Japanese Wikipedia
Read “Ninja” on DBpedia

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