Question

what is the significance of Australia in act​

Answer 1

The Australia Act ended all power of the UK Parliament to legislate with effect in Australia – that is, "as part of the law of" the Commonwealth, a state or a territory.

$∙→$ Citation: Act No. 142 of 1985

$∙→$Commenced = 3 March 1986

$∙→$Enacted by =Parliament of Australia

$∙→$Royal assent= 4 December 1985

Answer 2

According to the long title of the Australian act, its purpose was "to bring constitutional arrangements affecting the Commonwealth and the States to be brought into conformity with the status of the Commonwealth of Australia as a sovereign, independent and federal nation".