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[Ai-hanmi] Tenkan (or Tai-no-henko) [相半身] 転換 or 体の変向
A turn in which the back leg of the hanmi stance is pulled back 180 degrees to reverse ones direction. The front foot of the stance is used as the pivot point. Unlike a pivot, ones stance is the same as before the move, but one is facing the opposite direction.
Harvard Aikikai
Stance where the Nage and Uke are both standing with either both right feet or both left feet forward.