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Webster's Dictionary (1865)

Sū'pi-nā'tion, n.

noun

n. [Lat. supinatio, from supinare, to bend or lay backward, from supinus; Fr. supination, Sp. supinacion, It. supinazione. See SUPINE.]

  1. The act of lying, or state of being laid, with the face upward.
  2. The act of turning the palm of the hand upward, or the position of the hand with the palm upward.