Ninja definitions

nĭn'jə
A member of a class of medieval Japanese mercenary agents who were trained in the martial arts and hired for covert operations such as assassination and sabotage.
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Any of a class of feudal Japanese warriors highly trained in stealth and employed as spies and assassins.
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The definition of ninja is a warrior or assasin trained in the martial art ninjutsu, including the stealth methods of disguise, warfare and weapon skills.

An example of a ninja is Hattori Hanzo of Japan, a samurai who lived from 1542 to 1596, whose descendants published ninjutsu manuals.

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Origin of ninja

Japanese nin to endure (from Early Middle Chinese ɲin’) (also the source of Mandarin rěn) sha person (from Middle Chinese tʂia´ pronoun for head of a relative clause) (also the source of Mandarin zhě)