A premonition is something you "see, feel or hear" happen before it happens. A "deja vu" moment is when you see, hear, feel or experience something that makes you feel like you've done it, seen it, heard it, felt it or experienced it before. Example-You get the feeling someone is going to call you from out of no where, then that person calls (premonition). Your walking down the street and you see a pair of shoes in the window of a shop. You suddenly feel like you've done this and seen this before but know you haven't. I get both experiences quite a few times a month.