Ninjutsu definitions

(martial arts) The Japanese martial art that is a collection of techniques originally practiced for Japanese espionage purposes, and includes methods of gathering information, nondetection, avoidance, and misdirection techniques. Used by ninja (忍者).
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Origin of ninjutsu

From Japanese 忍術 (ninjutsu にんじゅつ), from Middle Chinese 忍 (nyín "to forbear") + 術 (ʑwit "technique").