The first definition, surprising and wonderful event, is correct. "A miracle of modern science." "It's a miracle that he graduated college.". In this definition, there can be a sense that you never thought something would happen, given the specific circumstances The second definition, an impossible event, is not quite accurate. More accurately, an event or occurrence which cannot be explained by the current knowledge of humans and is associated with the supernatural. While there are countless miracles that we cannot explain, quite often as science and technology progress, we learn that these types of miracles can be explained by our knowledge and are not supernatural. But, no one can explain, really, how we all got here. Now that is a miracle!!