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Ninjas may seem mysterious, but the origin of their name is not. The word ninja derives from the Japanese characters nin and ja. Nin initially meant "persevere," but over time it developed the extended meanings "conceal" and "move stealthily." In Japanese, ja is the combining form of sha, meaning "person." Ninjas originated in the mountains of ancient Japan as practitioners of ninjutsu, a martial art sometimes called "the art of stealth" or "the art of invisibility." They often served as military spies and were trained in disguise, concealment, geography, meteorology, medicine, and also the arts of combat and self-defense we associate with modern martial arts. Popular legends still identify them with espionage and assassinations, but modern ninjas are most likely to study ninjutsu to improve their physical fitness and self-defense skills.
Examples of ninja in a Sentence
Joseph States, Chicago Tribune, 5 July 2025
The anthology film follows three human warriors in history – a Viking warrior woman, a ninja in feudal Japan and a World War II ace – being stalked as prey by alien hunters with high-tech weaponry and a mean streak.
—Brian Truitt, USA Today, 14 June 2025
The 90-minute film follows three different warriors throughout history: A Viking raider and her son on a quest for revenge; two Japanese brothers—a ninja and a Samurai—who turn on one another in a war of succession; and a WWII pilot who investigates an extraterrestrial threat.
—Erik Kain, Forbes.com, 6 June 2025
These include a raccoon dressed as a ninja with a katana and a Jingasa hat, which should be officially added to the game before the next update.
—John Mac Ghlionn, Newsweek, 14 Jan. 2025
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Cite this Entry
“Ninja.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ninja. Accessed 15 Jul. 2025.
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ninja
noun
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