(a) Amusement device means any contrivance that carries and conveys passengers along, around or over a fixed or restricted course or within a defined area for the purpose of amusing or entertaining its passengers, and which is of such nature that accidental personal injuries may be incurred in its assembly, disassembly, or use.

(b) Permanent device means a device which is used, or intended to be used, as an amusement device that is erected to remain a lasting part of the premises.

(c) Temporary device means a device which is used as an amusement device that is regularly relocated from time to time with or without disassembly.

(d) Temporary structure means a structure designed to be relocated from time to time with or without disassembly and used or intended to be used for amusement purposes or public occupation in connection with such purposes.