3 Pa. Stat. § 1503
The following words and phrases when used in this act shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Activity day." The conducting of a minimum of six hours of events, activities or programs within a calendar day.
"Agricultural fair." An annual agricultural exhibition contributing to the development of several or many phases of agriculture or agribusiness by the conduct of educational programs, activities, demonstrations, contests and exhibits.
"Class A fair." An annual agricultural event which operates on 40 acres or more of land and pays $10,000 or more in premiums to winners of agricultural or agribusiness contests or exhibits.
"Class B fair." An annual agricultural event which operates on 30 acres or more of land and pays $7,500 to $9,999 in premiums to winners of agricultural or agribusiness contests or exhibits.
"Class C fair." An annual agricultural event which operates on 20 acres or more of land and pays $5,000 to $7,499 in premiums to winners of agricultural or agribusiness contests or exhibits.
"Class D fair." An annual agricultural event which operates on 10 acres or more of land and pays $2,500 to $4,999 in premiums to winners of agricultural or agribusiness contests or exhibits.
"Class E fair." An annual agricultural event which operates on fewer than 10 acres of land and pays less than $2,500 in premiums to winners of agricultural or agribusiness contests or exhibits.
"Department." The Department of Agriculture of the Commonwealth.
"Open Class." An event for which agricultural or agribusiness premiums are paid and which is open to participants who need not be associated with any particular organization.
"Secretary." The Secretary of the Department of Agriculture of the Commonwealth.
3 P.S. § 1503