In many dojos, Aikido instruction is supported by specific phrases and ideas. These “aikido concepts” often connect back to sayings of O Sensei Morihei Ueshiba, the founder of Aikido. In our dojo, we focus on a specific Aikido concept each month and use these concepts as a way of illuminating and structuring our training. This page does not attempt to provide a complete list of concepts (indeed, I’m starting with only one), but rather to serve as a resource for the concepts that we are focusing on in our dojo. While there are a number of extensive dictionaries of Aikido terms available (here, here and here), Wikipedia has made an effort to compile a list specifically of Aikido concepts used to facilitate technical training and deeper understanding.
Fudoshin means “immovable mind.” It is an idea connected to the quiet mind of zen meditation.
This article gives an excellent historical perspective:
martialarts.com: fudo, defining martial concepts.
While this article puts the term more explicitly in the context of Aikido:
Aikido No Sekai: Fudoshin, the indomitable spirit
Masakatsu Agatsu 正勝吾勝
Masakatsu agatsu means “true victory; victory over oneself.” I link here to three articles describing the concept and it’s interpretation in the context of the study of aikido.
Muteki is a Budo phrase with application in many martial arts. In day-to-day language it is translated as “invincible,” but the kanji that make it up literally mean “no enemy”: mu (無) means absence and teki (敵) means enemy. I think it is this latter meaning which is especially relevant for Aikido.
I only found one article on this topic around the web. It would be nice to have more.