Of one’s own free will, of one’s own volition.

A document issued by the Pope on his own initiative directed to the Roman Catholic Church.

plural of motu proprio

(law) Of one's own accord.

The sense of the position of parts of the body, relative to other neighbouring parts of the body.

plural of proprioceptor

(anatomy) A nerve ending that functions as a sensory receptor in muscles, tendons, joints and the inner ear; they respond to movement and position

Of or pertaining to proprioception

plural of proprioception

(anatomy) Relating specifically to the spine, and especially to those structures that connect segments of the spine