Aikido concepts are ideas that form the philosophical or technical basis of the Japanese martial art aikido. Aiki means the defender blends without clashing with the attacker, then goes on to dominate the assailant through the application of internal strength or Ki energy to effect techniques. Blending with an attacker's movements allows the Aiki practitioner to control the actions of the attacker with minimal effort. Hanmi describes the idea that the sides of the body work as a unit (for example: left hand and left foot forward). Usually, though not exclusively, descriptive of the movement in Aikido. Closely related to the development of Chushin-ryoku. Often used to refer to the triangular stance (kamae) of Aikido. Similar stances and the same word are used in other martial arts and traditional theater, including sumo and kyōgen. Chūshin-ryoku . Chūshin-sen . The term is also associated with kendo. Ichi-go ichi-e describes a cultural concept often linked with tea master Sen no Rikyū. The term is often translated as "for this time only", "never again", or "one chance in a lifetime". Ichi-go ichi-e is linked with Zen Buddhism and concepts of transience. The term is particularly associated with the Japanese tea ceremony, and is often brushed onto scrolls which are hung in the tea room. In the context of tea ceremony, ichi-go ichi-e reminds participants that each tea meeting is unique. Irimi describes entering straight into a technique, as opposed to the more indirect entrance into technique called tenkan. Irimi usually looks like a step forward, straight or at an angle but usually ending with the body facing the attacker, rather than in the direction of the step. To enter with irimi, the defender needs to move in the very moment of the attack or even himself initiate it. Katsu hayabi is a highly developed state in which an aikido practitioner has reached spiritual and moral perfection, and becomes immune to violence. "Victory" occurs at the speed of light -- meaning instantaneous—because an opponent cannot even begin an attack. speed of light is much slower than "instantaneous"... Kokyū-Ryoku Is the concept of relaxed power generated from the tanden. There is an implication in the word kokyū that this type of power does not clash with uke. Kuzushi is the Japanese term for unbalancing an opponent in the martial arts. The noun comes from the intransitive verb, kuzusu, meaning to level, pull down, or demolish.