Русско-англо-русский юридический словарь

An Act of Parliament is a statute enacted as primary legislation by a national or sub-national parliament. In the Republic of Ireland the term Act of the Oireachtas is used, and in the United States the term Act of Congress is used. (Wikipedia)

What the doctrine establishes is the legal supremacy of statute. It means that there is no source of law higher than - ie more authoritative than - an Act of Parliament. (parliament.co.uk)