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The term "budō" is a modern one, and is normally intended to indicate the practice of martial arts as a way of life, and encompassing physical, spiritual, and moral dimensions with a focus of self-improvement, fulfillment, or personal growth. The terms bujutsu and bugei have more discrete definitions, at least historically speaking. Bujutsu refers specifically to the practical application of martial tactics and techniques in actual combat. Bugei refers to the adaptation or refinement of those tactics and techniques to facilitate systematic instruction and dissemination within a formal learning environment. The historical origin of Japanese martial arts can be found in the warrior traditions of the samurai and the caste system that restricted the use of weapons by members of the non-warrior classes.