The following terms, whenever used or referred to in this act, shall have the following meanings except in those instances where the context clearly indicates a different meaning:
"Department" means the Department of Community Affairs.
"Secretary" means the Secretary of the Pennsylvania Department of Community Affairs.
"Demonstration" means any new mode of approach employed as an attempt to solve a problem for which aid under existing programs is not available.
"Urban unit" means an integrated economic and social unit with an urban population nucleus.
"Applicant" means a municipality of over fifteen thousand population, according to the latest United States Census, which serves as the nucleus of the urban unit.
71 P.S. § 1049.103