(1) “Charter amendment” means language which will amend, adopt or repeal a municipal charter.

(2) “Chief executive officer” means the mayor if such there be or, if there be none, then it means the president of the legislative body of a municipal corporation or, if there be none, then it means the presiding officer of the legislative body of a municipal corporation.

(3) “Municipal corporation” includes all cities, towns and villages created before or after December 28, 1961, under any general or special law of this State for general governmental purposes which possess legislative, administrative and police powers for the general exercise of municipal functions and which carry on such functions through a set of elected and other officials.

(4) “Qualified voter” means those persons who, under the terms of a municipal charter, shall be authorized to vote in elections within that municipal corporation.