(Latin: inclined, face down)
2. To turn into a prone position; to rotate (the hand or forearm) so that the surface of the palm is downward or toward the back.
3. To turn (the sole of the foot) outward so that the inner edge of the foot bears the weight when standing.
4. To assume or place in a prone position.
Applied to the hand, the act of turning the palm posteriorly (or inferiorly when the forearm is flexed), performed by medial rotation of the forearm.
Applied to the foot, a combination of eversion and abduction movements taking place in the tarsal and metatarsal joints and resulting in lowering of the medial margin of the foot, hence of the longitudinal arch.
2. Relating to a condition of suffering from something: Ken has a prone depression and needs psychiatric help.
Sharon has a prone reaction to giggling at the most inappropriate times.3. Etymology: from Latin pronus, "bent forward" from pro-, "forward."