Definition of ninja noun from the Oxford Advanced Learner's Dictionary

 

ninja

 noun
noun
BrE BrE//ˈnɪndʒə//
 
; NAmE NAmE//ˈnɪndʒə//
 
(pl. ninjas, ninja)(from Japanese) Combat sports
 
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a person trained in traditional Japanese skills of fighting and moving quietly See related entries: Combat sports Word OriginJapanese, literally ‘spy’.
See the Oxford Advanced American Dictionary entry: ninja