prōˈnāshən noun
( -s )
Etymology: pronate + -ion
1.
a. : a medial rotation of the hand and radius around the ulna so that the palm is turned backward or downward ; also : the position resulting from this movement — opposed to supination
b. : the act or state of lying face downward
2. : a faulty foot posture characterized by toeing out and usually associated with sagging of the inner arch and inward tipping of the ankle joint