ยง 1980. Definitions.    When used in this article, the following terms
  shall mean:
1. The term "board of education" shall mean the trustee,  trustees  or
  board  of  education of any common, union free, central, central high or
  city school district, or a board of cooperative educational services.
2. The term "school district"  shall  mean  any  common,  union  free,
  central, central high or city school district, or a board of cooperative
  educational services.
3.   The   term   "district   superintendent"  shall  mean  the  chief
  administrative officer of a supervisory district as defined  in  article
  forty-five of this chapter.