High Quality Content by WIKIPEDIA articles! The Constitution of Australia is the supreme law under which the Australian Commonwealth Government operates. It consists of several documents. The most important is the Constitution of the Commonwealth of Australia. The Constitution was approved in referendums held over 1898–1900 by the people of the Australian colonies, and the approved draft was enacted as a section of the Commonwealth of Australia Constitution Act 1900 (Imp), an Act of the Parliament of the United Kingdom.