| Satori | 悟 り | enlightenment ("understand") |  |
| Sen no sen | 先 の 先 | a defensive initiative launched simultaneously with the attack | |
| Sensen no sen | 先 先 の 先 | an initiative launched in anticipation of an attack where the opponent is fully committed to their attack | |
| Senshin | 先 心 | Purified Mind | |
| Shin | 心 | Mind | |
| Shin | 身 | Body | |
| Shin Shin Toitsu Do | 心 身 統 一 道 | way of mind and body unification | |
| Shin-Shin-Toitsu | 心 身 統 一 | unification of mind and body | |
| Shin-Shin-Toitsu-Aikido | 心 身 統 一 合 氣 道 | aikido with mind and body unified | |
| Shinshin | 心 身 | mind and body | |
| Shisei | 姿 勢 | Posture and attitude | |
| Shoshin | 初 心 | Beginners Mind |  |
| Sotaiho | 操 体 法 | method to affect the body of another person | |