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Webster's Dictionary (1865)

Pro-nā'tion, n.

noun

n. [Fr. pronation, It. pronazione, from Lat. pronare, pronatus, to bend forward, from pronus. See PRONE.]

  1. That motion of the fore-arm whereby the palm of the hand is turned downward; — opposed to supination.
  2. That position of the hand when the thumb is turned toward the body, and the palm downward.
  3. The act of turning the palm downward.