Common? Perhaps. But I could very easily answer "I, nor you, nor anyone, have any way of knowing." Which, if we apply a sort of burden of proof, we can state as a provisional "no", barring some incredible argument.
As a hint, lemme ask: How is it that you learned what consciousness is? Could anyone have shown you theirs? Or pointed out yours? Setting your own experience aside, could anyone ever have shown another person theirs? Or had theirs pointed out by another?
Unless you are defining consciousness via publicly observable behavior (I may well be the only one here even suggesting such a thing; I've been gone for a bit, so I don't quite know), I think those questions will be problematic.
It's not that there are not common definitions. It is, rather, that none of them make sense.