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Dimension

A measurement [parameter] of an object's characteristics in space and time that describe quantities like position, length, width, depth, size, speed, etc. We perceive three spatial dimensions - length, width and depth - and a single forward direction of time. In physics time is symmetric in two directions instead of just the single thermodynamic one we experience (toward increasing entropy), and physical GUT theories include a few or many 'extra' dimensions [String theories, M-brane theories] to increase the number of parameters [degrees of freedom] involved in fundamental interactions.

Web Resources On Dimension

Looking for Extra Dimensions?
Wikipedia: Dimension

Book Resources On Dimension

The Large, The Small and the Human Mind by Roger Penrose
In Search of Schrodinger's Cat by John Gribbin

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