from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. Law In one's own person, especially without representation by an attorney.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. By the person himself/herself; often used when a defendant is representing himself/herself in court without an attorney.
from The Century Dictionary and Cyclopedia
- In one's own person; by or through one's self and not another.
Medieval Latin in propriā persōnā : Latin in, in + Latin propriā : feminine ablative sing. of proprius, one's own + Latin persōnā, ablative of persōna, person.(American Heritage® Dictionary of the English Language, Fourth Edition)
directly from Latin (Wiktionary)