What are the dimensions?

Answer 1

The dimensions as we know them currently break down as follows:

1: An infinitely small point

2: A line- a point with only width

3: A plane- a line which know has height and width

4: A solid- a line with breadth, depth and width

5: Movement/change- generally referred to as time.

Since the 1st dimension is effectively non-existent, we start counting at the line which is why a solid, like a cube, is considered 3 dimensional and not 4 dimensional.

The dimension of time is really only half a dimension, as we are only able to move in one direction through it (this is referred to as time asymmetry) rather than having a full range of motion.

String theory currently postulates as many as 11 dimensions though currently we do not have any descriptions of them. Though they are generally believed to be extremely small (subatomic) and curled up very tightly.