Pa. Const. art. IX, § 14

As used in this article, the following words shall have the following meanings: "Municipality" means a county, city, borough, incorporated town, township or any similar general purpose unit of government which shall hereafter be created by the General Assembly. "Initiative" means the filing with the applicable election officials at least 90 days prior to the next primary or general election of a petition containing a proposal for referendum signed by electors comprising 5% of the number of electors voting for the office of Governor in the last gubernatorial general election in each municipality or area affected. The applicable election official shall place the proposal on the ballot in a manner fairly representing the content of the petition for decision by referendum at said election. Initiative on a similar question shall not be submitted more often than once in five years. No enabling law shall be required for initiative. "Referendum" means approval of a question placed on the ballot, by initiative or otherwise, by a majority vote of the electors voting thereon.