What is the world's biggest island?

an island is still an island even if it's a continent too

this is a perennial argument amongst quizzers, though must say I support idea Australia is an island

Ridiculous! An island is any land entirely surrounded by water ie Australia

Ok guys, some of the data I have collected to end all of the arguments. You can check other data on Google too According to Britannica, an island is a mass of land that is both “entirely surrounded by water” and also “smaller than a continent.” By that definition, Australia can't be an island because it's already a continent. Australia is one of seven continents, it is located in the South Pacific as an island. Australia is known as an island continent because it is the only continent that is also a country and is surrounded by water on all four sides. The main reason is all about the continental shelf and not the coastline–Greenland is connected to North America to the continental shelf while Australia has its own shelf.

This must stop Australia is Still an island whether it's a continent or not, it has no land border with any other country.

WRONG!! Time this INCORRECT answer was amended.

SloaneRanger2019, an island is an island no matter how big.

Oceania is the continent. Australia belongs in this continent like New Zealand.