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Ōsensei, meaning "great teacher" in Japanese, is the common title given to Morihei Ueshiba, the founder of aikido. He developed aikido by synthesizing his martial studies, spiritual beliefs, and life experiences. Ōsensei's unique approach to martial arts emphasized non-violence, harmony, and the redirection of an opponent's energy rather than direct confrontation. His teachings have influenced millions of people worldwide and continue to be studied and practiced today.