As used in this article, the term:

(1) "Court order for child support" means any judgment or order of the courts of this state or another state and includes orders in criminal proceedings which result in the payment of child support, as a condition of probation or otherwise.

(2) "Department" means the Department of Human Resources.

(3) "Dependent child" means any person under the age of 18 who is not otherwise emancipated, self-supporting, married, or a member of the armed forces of the United States.

(4) "Duty of support" means any duty of support imposed or imposable by law or by court order, decree, or judgment.

(5) "IV-D" means Title IV-D of the federal Social Security Act.

(6) "IV-D agency" means the Child Support Enforcement Agency of the Department of Human Resources and its contractors.

(7) "Parent" means the natural or adoptive parents of a child and includes the father of a child born out of wedlock if his paternity has been established in a judicial proceeding or if he has acknowledged paternity under oath either in open court, in an administrative hearing, or by verified writing.