Ninja/ˈnɪndʒə/ Definition 1 of 3Pro Tip 1/3Cultural Origin ‘Ninja’ refers to a specific Japanese historical figure. Know the cultural background. Ninja movies often depict scenes in historical Japan. Pro Tip 2/3Stealth Focus Ninjas are associated with stealth, not brute force, reflecting their secret missions. He moved like a ninja, silently approaching the guard. Pro Tip 3/3Pop Culture Ninjas are popular in movies and comics, with some creative liberties taken. The ninja character in the comic used a magic sword.