Sui Juris “Legally” Defined

The following definitions for “sui juris” are taken from Ballantine’s Law Dictionary (3rd edition), Bouvier’s Law Dictionary (6th edition), and Black’s Law Dictionary (2nd edition):



Of full capacity. In his own right; capable of entering in a contract [see 1 Bl Comm 443; for definition of the term as it pertains to contributory negligence of children [see Anno: 107 ALR 161].



  1. One who has all the rights to which a freeman 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].



Latin. Of his own right; possessing full social and civil rights; not under any legal disability, or the power of another, or guardianship.

Having capacity to manage one’s own affairs; not under legal disability to act for one’s self [Story, Ag. § 2].

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