For purposes of this title:
(1) "Adjudication" has the same meaning as "conviction" in RCW 9.94A.030, but only for the purposes of sentencing under chapter 9.94A RCW;
(2) "Court" when used without further qualification means the juvenile court judge(s) or commissioner(s);
(3) "Custodian" means that person who has the legal right to custody of the child;
(4) "Department" means the department of children, youth, and families;
(5) Except as specifically provided in RCW 13.40.020 and chapters 13.24 and 13.34 RCW, "juvenile," "youth," and "child" mean any individual who is under the chronological age of eighteen years;
(6) "Juvenile offender" and "juvenile offense" have the meaning ascribed in RCW 13.40.020;
(7) "Parent" or "parents," except as used in chapter 13.34 RCW, means that parent or parents who have the right of legal custody of the child.