As used in the Ambulance Service Districts Act unless the context clearly requires otherwise:
1. "District" means a public ambulance service district as licensed by the State Department of Health;
2. "Board" means the governing body of a district; and 3. "Board of county commissioners" and "county clerk" shall mean, respectively, the board of county commissioners and county clerk of the county in which the greatest portion of the territory of any proposed district is located.