The following words and phrases when used in this chapter shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Board." The Environmental Improvement Compact Board elected under this chapter.
"Election officials." The county boards of election, except in Philadelphia where the term means the city commissioners.
"Electors." The registered voters of any municipality involved in proceedings relating to the environmental improvement compact.
"Environmental improvement compact." A structure of government and powers concerning one or more municipal functions involving two or more municipalities in this Commonwealth under procedures provided in this chapter.