It is true that there are multiple definitions of a continent. But it is also true that Europe fails to satisfy any of them. One of the boundaries between Europe and Asia was chose arbitrarily(the Ural mountains)by Peter The Great and before that, it was the Russian border(a line in the sand). It is not even a subcontinent like India and Arabia.The separation between Europe and Asia was a hypothesis of ancient Greek cartographers; who discovered that both Europe and Asia were part of a single landmass. So can we assume that this is just political on the part of Europeans who like feeling special?