Time is not the 4th Dimention (Score 1)

It bothers me how people always say that time is the 4th dimention. Looking at the first 3 dimentions, you would think that the forth dimention would simply be perpendicular to the 3rd, as the 3rd dimention is perpendicular to the 2nd... (or many 2D's aligned perpendicularly to eachother) Why is it that the first 3 dimentions are considered spatial, but not the forth? Just because we cannot imagine it, doesn't mean it cannot be. Time is NOT the 4th dimention