3. In this Part—

“appointed day” has the meaning given to it by section 4(3);

“enactment” means—

(a) an Act of the Oireachtas,

(b) a statute that was in force in Saorstát Éireann immediately before the date of the coming into operation of the Constitution and that continues in force by virtue of Article 50 of the Constitution, or

(c) an instrument made under an Act of the Oireachtas or a statute referred to in paragraph (b).