Where it appears to the Minister to be necessary or expedient in the interest of persons to whom goods, services, accommodation or facilities, of any description are supplied or provided that any words or expressions used in relation to the goods, services, accommodation or facilities should be understood as having definite meanings, the Minister may by order assign meanings either -
(a) to those words or expressions when used in the course of a trade or business, as, or as part of, a trade description applied to goods, services, accommodation or facilities, of that description, or
(b) to those words or expressions when so used in such circumstances as may be specified in the order,
and where such a meaning stands so assigned to a word or expression, it shall be deemed for the purposes of this Act to have that meaning when used in the manner mentioned in paragraph (a) or (b), as the case may be, of this section.