We travel at the speed of light in the dimenson of time.what is the meaning of this?i am referring to minkowsky space

The concept of speed as you're using it is a misnomer because speed is distance traveled per unit time and in this context "distance" does not have the same meaning that you're used to, hence the confusion. The distance isn't a distance at all. It never should be called that in fact. When people use that notion they're thinking of the magnitude of something called the

*metric*. In Euclidean geometry the expression for the metric is

[tex]\Delta L^2 = \Delta x^2 + \Delta y^2 + \Delta z^2[/tex]

For two closely spaced points. In this case the "distance" between the points is [tex]\Delta L[/tex] .