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Meaning of proprio motu*

pro•pri•o mo•tu

Pronunciation: (prô'pri-ō" mō't Eng. prō'prē-ō" mō't), [key]
— Latin. Latin.
  1. by one's own volition; on one's own initiative.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.