: : : : : : : The real fourth dimension is TIME. There are a number of other theoretical dimensions in quantum mechanicvs, but I sopmehow don't think that these are the ones to which you refer (nor am I at all certain that they have numbers assigned...).

: : : : : : Time is nothing more than a tool used in measuring the rate at which the universe moves....ie moles,lbs, and g. Nothing more than a measuring cup, not a demension.

: : : : : Chris, you should check on that. Remember, dimensions do not necessarily have to be spatial, they can also be temporal. Time is definitely a dimension -- which one it is may be up for debate, but it is a dimension nonetheless.

: : : : I have a few questions for anyone who cares to answer:

: : : : 1. Why do you think that time is anything more than a concept?

: : : : 2. What exactly is the definition of a dimension (a good explanation)?

: : : : 3. Why do people think that there are "dimensions" anyway?

: : : i love your questions and i want to know too : : : so that way we can be on the same foot for a definition!!

: : Thanks, I think that a lot of the misunderstandings and disagreements that occur, happen because there are so many different definitions for things which can really lead to confusion.

: I believe one can consider the notion of dimension in the mathematical sense:

: An independent variable that cannot be broken down into smaller, independent variables.

an excellant book to read on higher dimensions is called hyperspace.I do not know the authors name off hand.It can be purchased at barnes and noble.My perception of a fourth dimension can be illustarated in an example. Suppose you are a character in a video game,your world is the perceived three dimensional relm in which you are existing, however i am looking into your world from outside the game and am completely beyond your perceptible view and beyond the laws of your dimensional world of time and space.