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:
"Authority." A body politic or corporate established by a city of the second class , except a joint authority established by a city of the second class and a county of the second class, under 53 Pa.C.S. Ch. 56 (relating to municipal authorities), under the former act of June 28, 1935 ( P.L. 463, No.191), known as the Municipality Authorities Act of one thousand nine hundred and thirty-five, or under the former act of May 2, 1945 ( P.L. 382, No.164), known as the Municipality Authorities Act of 1945, which owns or operates equipment or facilities for any of the following purposes:
66 Pa.C.S. § 3201