| Jeet Kune Do: | (Cantonese) “Way of the intercepting fist.” A collection of basic mental and physical concepts, observations of combat maneuvers, and philosophies of attitude gathered and developed by the late Bruce Lee. | |
| Jeja: | Student. | |
| Jikan: | “Time.” A term used by the timekeepers at the beginning and end of a Japanese style match. | |
| Jing: | The Chinese term used for using an opponent’s own energy against him. | |
| Jip joong: | Concentration. | |
| Jip Joong | “Power gathering.” The act of breathing while meeting an opponent’s attack in order to unify one’s internal and external forces. | |
| Jirugi: | Punch. | |
| Jitsu: | “Fighting art” | |
| Jiyu: | Freedom (of movement, et al). | |
| Jo: | “Staff.” A four foot long wooden staff. | |
| Jodan: | “Upward” or “upper level.” A compound word affixed to the name of techniques in Japanese karate. | |
| jodo: | “Way of the stick.” The Japanese method of stick fighting using a jo. Also known as jojutsu. | |
| jogai: | “Out of bounds.” A term used by a referee to denote that either or both contestants are out of bounds. | |
| Jojutsu: | See “jodo.” | |
| Jonin: | A ninja leader. | |
| Joomuk: | Fist. | |
| Joseki: | In a traditional Japanese dojo, the area where instructors often times line up and face the students at the beginning and end of each practice session. | |
| Jofu fa: | An ancient form of Chinese combat that emphasized close-range grappling techniques. | |
| Judo: | “Gentle way.” A Japanese art of self-defense and a sport with Olympic recognition. Judo is a method of turning an opponent’s strength and overcoming by skill rather than sheer strength. | |
| Judogi: | The uniform worn by a Judo practioner. | |
| Judan: | 10th degree black belt in traditional Japanese styles. | |
| Jujutsu: | “Art of gentleness.” Literally, the technique or the art of suppleness, gentleness. All of these terms, however, represent a single principle, a general method of applying a technique using the human body as a weapon in unarmed combat. Also known as jiu jitsu. | |
| Judoka: | A practitioner of judo. | |
| Junbi sogi: | Ready stance. | |
| Jushin: | Center of gravity. | |
| Jutsu: | “Art.” A term linking a fighting method with the bugei, or martial disciplines of war, rather than with the sporting or aesthetic practices of modern Japan. | |
| Jutte: | A forked iron truncheon that can parry an attack by a sword. | |
| Jutte jutsu: | Art of the jutte. |
