The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise:
Political subdivision-A county, city, borough, incorporated town, township, school district, vocational school district and county institution district. For exemption purposes, the following are included under the definition of political subdivision:
Nonpublic schools not operated for profit-A school other than a public school within the Commonwealth, wherein a resident of the Commonwealth may legally fulfill the compulsory school attendance requirements of Commonwealth law, and in the operation of which there is no contribution of pecuniary gain or profit, no dividends or distribution of income to its owners, officers or directors, and no incidental profits are distributed to its owner. The definition of school does not include institutions of higher learning.
61 Pa. Code § 315.2