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A ninja (å¿è) or shinobi (å¿ã³) was a covert agent or mercenary in feudal Japan. The functions of the ninja included espionage, sabotage, infiltration, assassination and combat in certain situations.
Full Definition of NINJA. : a person trained in ancient Japanese martial arts and employed especially for espionage and assassinations. See ninja defined for English-language learners. See ninja defined for kids. ADVERTISEMENT.