Please define "causality", as precisely as you can. Presumably you'll need a "clock" of some kind, so please describe a clock in a way that it is independent o

Please define "causality", as precisely as you can. Presumably you'll need a "clock" of some kind, so please describe a clock in a way that it is independent of the speed of light and any particular frame of reference (unless you believe there is a preferred frame of reference. If so, which one is / which ones are?) Remember that the theory and experiment of special relativity state and show that the speed of light is always measured to be a constant, no matter who measures it and how they are moving with respect to anyone else.