Of full legal capacity, ie over 18 and with full mental capacity
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. To make a valid contract, a person must, in general, be sui juris. Every one of full age is presumed to be sui juris.
sui juris Of his or her own right. Of full legal capacity.
capable of managing one's affairs or assuming legal responsibility. Cf.