The following words and terms shall, whenever used in this chapter, have the meaning set forth in this section:
(1) The term "district" as used herein, shall include all municipal and quasi-municipal corporations having a governing body, other than cities, towns, counties, and townships, such as port districts, school districts, water-sewer districts, fire protection districts, and all other special districts of similar organization, but shall not include local improvement districts, diking, drainage and irrigation districts, special districts as defined in RCW 85.38.010, nor public utility districts.
(2) The words "board of commissioners," as used herein, shall mean the governing authority of any district as defined in subdivision (1) of this section.