The following terms are defined in Living the Martial Way by Forrest Morgan.

Ai: Blending, harmony, joining or union. Also, to concentrate or focus. (Japanese term)

Aiki: United spirit. The spiritual principle of destroying and adversary's will to fight, or the physical act of dominating an adversary by harmonizing with his force and redirecting it. (Japanese term)

Aikido: Modern Budo system derived from Daito Ryu Aikijujutsu. (Japanese term)

Aikijujutsu: Daito Ryu and the family of jujutsu systems descended from it emphasizing the development and the use of aiki. (Japanese)

Aikijutsu: The art of Aiki.

Ai Uchi: Harmonizing strikes. A circumstance of mutual killing in which two adversaries strike each other simultaneously. This concept is common to classical Japanese martial arts, particularly Kenjutsu.

Bakufu: The administrative bureacracy of Japan's Tokugawa Shogunate (1600-1868)

Budo: Martial Way. Originally referring to the Martial way, a warrior way of life devoted to self development, but now more commonly used in reference to specific modern combative systems.

Budo Shoshinshu: A 16th century treatise on Japanese warrior ethics and life styles written by Daidoji Yuzan.

Bugei: Literally "Martial art" The classical methods of fighting developed by japanese warriors for the sole purpose of real combat.

Bujutsu: Same as bugei.

Bunkai: Application. To practice forms or other solo training methods with a partner.

Bushi: A warrior of the samurai caste.

Bushido: Literally "Way of the Warrior" A feudal code of Japanese warrior ethics evolved from Confucian thought.