Sec. 3879.001. DEFINITIONS. In this chapter: (1) "Board" means the district's board of directors. (2) "Director" means a board member. (3) "District" means the Harris County Improvement District No. 18. Added by Acts 2009, 81st Leg., R.S., Ch. 872 (S.B. 2510), Sec. 1, eff. June 19, 2009.