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| I | |
| Ikaisen | First contest in tournament. |
| Ippon | One point. |
| Ippon-Sogo-Gachi | Compound win of waza-ari and a penalty benefit of a keikoko. |
| Itsutsu-no-kata | Forms of five, symbolising nature. |
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| J | |
| Ji | A Japanese ideograph. |
| Jigotai | Defensive Posture. |
| Jikan | Time out. Referee’s instruction to the timekeeper when a break or pause in the contest in necessary. |
| Jita Kyoyei | The principle that individual advancement benefits society as a whole. |
| Jitsu | Art. |
| Jogai | Outside mat area. |
| Jonai | Inside mat area. |
| Joseki | The place in a dojo where the seniors or VIPs sit. Seat of honour. |
| Ju | (a) Gentle – from Taoist philosophy and embodies the opposite of hard. (b) Ten. |
| Judo | Gentle Art (Way) |
| Judogi | Traditional costume worn by Judoka. |
| Judoka | Person practising Judo. |
| Jushin | Centre of gravity. |
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| K | |
| Kaeshi | Counter. |
| Kaeshi-waza | Counter techniques. |
| Kake | Actual act of throwing – application; execution. |
| Kai | Society, Club. |
| Kami | (a) Upper (b) Paper (c) Gods. |
| Kamiza | ‘Upper seat’ the instructors side of the dojo. |
| Kansetsu | A joint, articulation. |
| Kansetsu-waza | Technique of locking limb joints. |
| Kao | Face. |
| Kappo | Resuscitation technique. |
| Karu | To reap. |
| Keiko | Practise. |
| Keikoku | Warning. Penalty of 7 points. |
| Kempo | Method of fighting. |
| Ken | Sword. |
| Kendo | The ‘way’ of the sword. |
| Keru | To kick. |
| Kesa | A Buddhists monk’s surplice, worn diagonally across the body. |
| Ki | Psychic energy. |
| Kiai | A shout used to harden the body and strengthen the will when maximum effort is required. |
| Kime | To decide. |
| Kime-no-kata | Forms of decision. The kata of self protection. |
| Kiri | To cut. |
| Ko | (a) Small, minor. (b) Old, ancient. (c) Lecture, study. |
| Kodokan | Headquarters of Judo in Japan. |
| Koka | A score of 3 points. |
| Koshi | Hips. |
| Kubi | Neck. |
| Kuruma | (a) Wheel. (b) Vehicle. |
| Kuzure | Broken. |
| Kuzushi | Balance breaking. |
