Any comment on the words we are using, like 5D and high vibration? what do they mean compared to what our future reality will really be like?

We are using these words like 5D and vibration to try and understand concepts that are probably way beyond our ability to understand right now. But how accurate are these words for discribing "New Earth" / the future of the humans? 

If we asume that the "vibration" of the human future is 5D, what does that even mean? Will we have the mathematical equivalent of 5 dimensions? Like in the way 3D = up and down and side to side.. what then would 5D be like? No need to exist in liniar time and way more space somehow?

Is this even possible to attempt to explain to us now? Or should we just chill and think happy thoughts heh? (or no thoughts probably) xD