[ nin-juh ]
/ ˈnɪn dʒə /

noun, plural nin·ja, nin·jas.

(often initial capital letter) a member of a feudal Japanese society of mercenary agents, highly trained in martial arts and stealth (ninjutsu), who were hired for covert purposes ranging from espionage to sabotage and assassination.
a person who is expert or highly skilled in a specified field or activity (often used attributively): marketing ninjas; ninja gamers.

Origin of ninja

< 1960–65; Japanese, equivalent to nin- endure + -ja, combining form of -sha person (< Middle Chinese, equivalent to Chinese rěn + zhě) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for ninja


/ (ˈnɪndʒə) /

noun plural -ja or -jas

(sometimes capital) a person skilled in ninjutsu, a Japanese martial art characterized by stealthy movement and camouflage

Word Origin for ninja

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012