Einstein used reinman geometry (a kind of non-euclidean geometry where there are no parralel lines and other stuff) to describe how mass warps a four dimensional field (length, width, depth, time) and thus describes gravity.

this is the General Theory of Relativity

http://library.thinkquest.org/27930/media/metrictensor.gif

Later, The kaluza-Klein theory arose by adding one dimension to the General Theory of Relativity to give both gravity AND electromagnetism, the force which manifests itself as electricity, magnetizm, light, and chemical bonds.

http://feynman.physics.lsa.umich.edu/seminars/oklecture/oklecture11.gif

Eventially, you could add another twodeminsions to give the weak nuclear force, which is responsible for some kinds of nuclear decay, and finally four more dimensions to describe how quarks form together to make protons and neutrons.

http://members.aol.com/yggdras/paraphysics/image2.gif

Now, there is another little thing called the Standard Model:

which describe elementary particles by their mass, charge and spin.

A dimension is simply a linear measurement.

If space and time are dimensions, can mass, charge and spin be dimensions, too?

If so, can 11-D supergravity/supersymmetry/superstrings/M-theory have the additional three standard model dimensions added to it and yield more discoveries?