/ Dictionary / Index P proprio motu*: Meaning and Definition of Find definitions for: pro•pri•o mo•tu Pronunciation: (prô'pri-ō" mō't Eng. prō'prē-ō" mō't), [key] — Latin. Latin. by one's own volition; on one's own initiative. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. proprioceptor prop root Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language