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/suÂ·piÂ·naÂ·tion/ (sooâ³pÄ­-naÂ´shun) [L. supinatio ] the act of assuming the supine position, or the state of being supine. Applied to the hand, the act of turning the palm forward (anteriorly) or upward, performed by lateral rotation of the forearm. Applied to the foot, it generally implies movements resulting in raising of the medial margin of the foot, hence of the longitudinal arch.
Pronation is a inward rotation of the arm or the foot, supination is an outward rotation (the opposite). Pronation roughly means downward facing. Examples of this would be tur â¦ ning your palms down towards the floor or lying on your stomach.