Unless a different meaning plainly is required in this chapter:
(1) “Nonpartisan” means not controlled or influenced by any single political party.
(2) “Board” means the group of trustees who manage the library.
(3) “Mayor” means the elected chief municipal officer of a city.
(4) “City manager” means a person appointed as chief municipal administrator by a city council.
(5) “City council” means the legislative body of a city.