The abstract plane that is a result of the movement of matter through the other three.

In my opinion there is no 4th demension. It's death.

Time.

It would have to be time, this is the way we set up a meeting. the place being somewhere in the normal three dimensions, and the time being the point on the fourth.

It's time. Height, width, depth and time.

Summary: the fourth dimension is a mathematical concept to describe the "world", when three dimensions are not enough. In geometry, there are normally three dimensions to describe the space where we live. But in a mathematical generalisation of the 3 dimensional geometry, you could use as many dimensions as you like. You have to assume that you leave the space with a given number of dimensions where you have been until now, and go, say 1 meter in a new direction outside of it. In the theory, this could be easy. In common thinking, as we have learned to see the world as 3 dimensional, it can be much harder. If you want a concret representation of this, you have to think of some direction where you can go and which is outside of the space which you used until this step. Some problems occur also if you want all dimensions to have the same "value". For instance, for us, if we try to go up, we cannot go very high because we cannot fly, and very deep because we must dig. So if we spring outside the window, we usually just go down. If we change latitude, it could become too warm or too cold for us. Or if we look right or left, it is not the same kind of neck movement as if we look up or down. So the theoretical dimensions could have the same value, but the practical normally don't have. Some uses of a fourth dimension: - time could be considered as a fourth dimension. But as you now, we usually can move ourselves physically in just one direction of it - a fourth dimension has been used by physics as a model for a better understanding of the world (for the scientists). Nowadays, some theories use even a much greater number of dimensions. These models sometimes consider also time as a dimension. - some people in esoteric and unofficial science use a fourth dimension to describe what they call the astral plane Sources: http://en.wikipedia.org/wiki/Tessaract http://en.wikipedia.org/wiki/Dimensions http://en.wikipedia.org/wiki/Astral_plane

Answer 6 out of 6 by -O-uknow61 on Feb 19, 2007 at 5:00 pm Permalink Avatar The abstract plane that is a result of the movement of matter through the other three i think this is the most correct awnser,the 4th dimension is something you can't see,or so, we would see it as a 3d projection, it's the same thing if a 3d cube is drawn on a paper http://nl.youtube.com/watch?v=lEiNsrtuGcc&feature=related that might help you imagining the 4D;)