noun.
The act or result of pronating; the prone position of the fore limb, in which the bones of the forearm are more or less crossed, and the palm of the hand is turned downward: the opposite of supination.
the GNU version of the Collaborative International Dictionary of English
noun.
The act of turning the palm or palmar surface of the forefoot downward.
noun.
That motion of the forearm whereby the palm or palmar, surface is turned downward.
noun.
The position of the limb resulting from the act of pronation. Opposed to supination.