Shudō (衆道, shudō?) is the Japanese tradition of age-structured homosexuality prevalent in samurai society from the medieval period until the end of the 19th century. The word is an abbreviation of wakashudō (若衆道), "the Way of the young" or more precisely, the Way of young (若 waka) men (衆 shū). The "dō" (道) is related to the Chinese word tao, considered to be a structured discipline and body of knowledge, as well as a path to awakening.
The older partner in the relationship was known as the nenja (念者), and the younger as the wakashū (若衆).