from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Law Capable of managing one's own affairs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having the right and the capability to manage one's own affairs
from The Century Dictionary and Cyclopedia
- In Roman law, the status of any one who was not subject to the patria potestas.
- In modern legal usage, of full age and capacity, and legally capable of managing one's own affairs, as distinguished from infants, lunatics, and woman under common-law disqualifications of coverture.
Latin suī iūris : suī, of one's own + iūris, genitive of iūs, right, law.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin of one's own right (Wiktionary)