Hume gives us a different definition in his book:
A miracle is a violation of the laws of nature; and as a firm and unalterable experience has established these laws, the proof against a miracle, from the very nature of the fact, is as entire as any argument from experience can possibly be imagined. (Hume)
To Hume if it happens according to the established laws of nature, it is not a miracle, so basically if it happens then it is not a miracle. Scientifically there are no miracles, which means if it happens then there is a scientific reason that will explain it no matter how hare it is for the mind to grasp. From my religious background miracles do prove the existence of God because a miracle is the action of God used to show that he is there and he is watching over us. Gods miracles are also used to show nonbelievers that he is here with his arms open wide to accept all that take him into their heart, they are also used to punish the worst of nonbelievers and that shows others that he exists. Hume said:
I beg the limitations here made may be remarked, when I