Mo. Rev. Stat. § 456.1005: Rules of classification.

1. As used in this section, "adverse party" means a person with a substantial beneficial interest in property which would be affected adversely by a powerholder's exercise or nonexercise of a power of appointment in favor of the powerholder, the powerholder's estate, a creditor of the powerholder, or a creditor of the powerholder's estate.

2. If a powerholder may exercise a power of appointment only with the consent or joinder of an adverse party, the power is nongeneral.

3. If the permissible appointees of a power of appointment are not defined and limited, the power is exclusionary.