66 The Shorter Oxford English Dictionary defines "principal" as "first, chief, original, first or highest in rank, most important, foremost, greatest". Principal also commonly means "main". In my view the expression "principal place of business" in s 20(4)(c) means the chief, most important or main place of business from where the employer conducts most or the chief part of its business. If the employer is a large national employer conducting business in various States there might not be a principal place of business of the employer for the purposes of s 20(4)(c) as the main, or the most important, or the chief part of the employer's business is conducted from various places. It cannot have been intended by Parliament that in those circumstances the expression "principal place of business" for the purposes of s 20(4) simply means an entry on a registration form made by an employer and used by ASIC for administrative purposes.