Source : Webster's Revised Unabridged Dictionary (1913)

Ronin \Ro"nin"\, n. [Jap. r[=o]-nin, fr. Chin. lang profligate,
   lawless + j[^e]n (old sound n[=i]n) man.]
   In Japan, under the feudal system, a samurai who had
   renounced his clan or who had been discharged or ostracized
   and had become a wanderer without a lord; an outcast; an
   outlaw.