In this chapter:
(1) "Court" means any tribunal forming a part of the judiciary.
(2) "Director" means the administrative director of the courts appointed as provided by this chapter.
(3) "Office" means the Office of Court Administration of the Texas Judicial System.
(4) "Trial court" means any tribunal forming a part of the judiciary, except the supreme court, the court of criminal appeals, and the courts of appeals, but does not include the commissioners court of a county.