As used in chapters 1-4 of this title, unless the context otherwise requires:
(1) “Board” means the mayor and the aldermen;
(2) “Department head” means the city administrator, city recorder, treasurer, police chief and any other department heads appointed by the board or mayor;
(3) “Officer” means the mayor, aldermen, city attorney and city judge;
(4) “This charter” refers to chapters 1-4 of this title; and
(5) “Ward” means a geographical subdivision of the municipality established for the purpose of securing representation on the board.