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Game_boy said:
The fourth dimension doesn't have to be time. It could be probability or, like the Playstation 3 uses its GPU for, chicken nuggets.

 Ok, sure it doesn't have to be time...but in no way could it be probability or chicken nuggets. Neither of those two things can contain the 3 spacial dimensions.

 

Basically in order for something to be a new dimension it needs to be able to contain every X, Y, Z at any given point along its axis.  So for example, at any given point in time there exists every point in space.  So as a result any location is not accurately defined by just X, Y, Z but also requires T. 

I can illustrate this by saying "Meet me in Central Park NY City, at the yellow bench just inside the southeast entrance." which is an X, Y, Z coordinate.  To which you would probably reply "When?" which is your way of asking for the T coordinate.  Your question is valid because at every point in time there exists the space that is currently occupied by Central Park.  So I might answer your question with "Tomorrow at noon". In any case all of this information gives you the exact location in space-time we are to meet which is defined by the coordinate quadruplet (X, Y, Z, T).



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