[D-fendr]

Does that mean that time changes or the perception of time does?

The perception of time is a subjective experience that vary all the time. :) As far as relativistic time dilation: the objective measurement of time is different depending on your time frame (Lorentz transformation).

How did Einstein define the speed of light?

Are you thinking of "speed limit"?

[kosta50]

As far as relativistic time dilation: the objective measurement of time is different depending on your time frame (Lorentz transformation).

Then explain it.

Are you thinking of "speed limit"?

No, I said "speed of light".