Law Dictionary of Legal Terminology

SUI JURIS

SUI JURIS. One who has all the rights to which a freemen is entitled; one who is not under the power of another, as a slave, a minor, and the like.

2. To make a valid contract, a person must, in general, be sui juris. Every one of full age is presumed to be sui juris. Story on Ag. p. 10.