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It can be anything you like, although often it is time.
The fifth dimension is time travel; one step forward past the fourth dimension. So, it's just like building up energy and moving from one place to another. It would look just as it sounds. But, I think time travel is a stupid idea. It creates two alternate universes. One is the unchanged world where you didn't travel and one where you did, creating ANOTHER dimension.
'Demention' oh!!! you'll have me demented. I think you need to check your spelling. It is 'dimension'. 7 cm is approximately 3 inches.
Yes. The 4th dimension is time. According to String Theory (which is unverified), there may be as many as 11 dimensions, but dimensions above the fourth are hypothetical.
The 4th dimension is believed to be time, as represented as a one-way straight line.