For the purpose of this subchapter—

((1)) the term “missing child” means any individual less than 18 years of age whose whereabouts are unknown to such individual’s parent;

((2)) the term “Administrator” means the Administrator of the Office of Juvenile Justice and Delinquency Prevention;

((3)) the term “Center” means the National Center for Missing and Exploited Children;

((4)) the term “parent” includes a legal guardian or other individual who may lawfully exercise parental rights with respect to the child; and

((5)) the term “child sexual abuse material” has the meaning given the term “child pornography” in ;