You're misunderstanding Blizz. The fourth dimension IS time. Time was previously thought of something independent of space. (events occurred in space at a specific time) However, Einstein said that rather than our current understanding of space as three dimensional (x,y,z,), it was in fact four dimensional (x,y,z,t) using time as the fourth dimension. Now if I understood what I read in his works correctly, the first three dimensions (x,y,z) are curving into the fourth dimension (t, or time). I've read Einstein's actual work, and me and my tutor talked about it for hours, so yes, Blizz and I are both correct in saying time is the fourth dimension. Einstein said so multiple times, and if you read his mathematical equations, it uses time as the fourth dimension.