iai 居合い ( いあい ) - drawing and cutting with the sword

iaidou 居合道 ( いあいどう ) - the art of drawing and cutting with the sword

iaijutsu 居合術 ( いあいじゅつ ) - methods of drawing and cutting with the sword

iemoto 家元 ( いてもと ) - head family of a school

iga 伊賀 ( いが ) - an old province of Japan in the area that is today western Mie Prefecture

igadama 伊賀玉 ( いがだま ) - small round caltrops

injiuchi 印地打ち ( いんじうち ) - practice of throwing stones, sometimes as a game

inkajou 印可状 ( いんかじょう ) - authority to pass on the tradition;

ishinage 石投げ ( いしなげ ) - throwing rocks

ishu 伊州 ( いしゅ ) - another name for Iga Province

isshi souden 一子相伝 ( いっしそうでん ) - complete transmission of the techniques and principles of a ryuuha to a blood-heir

ita shuriken 板手裏剣 ( いたしゅりけん ) - plank shuriken; flat shuriken