well i know this is stupid but you know those things you go in that look like the front of a trai and it simulates you on a rollercoaster and whatnot... in scotland theres a "4-D" one at the Xscape center which claims the fouth dimention is heat.
4-D films (much the same^) is 3-D with a physical effect.
A 4-D film (or 4D) is an entertainment presentation system that combines a 3-D film with physical effects that occur in synchronization with the film. Since the physical effects are expensive to setup, 4-D films are currently only found at special venues, usually in amusement parks.
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Some of the effects currently simulated in 4-D films include rain, wind, and vibration. The use of water sprays and air jets are common also. A 4-D film is not shown in a motion simulator, although some seats in 4-D venues vibrate or may move a few inches during the presentation.
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Source= Wikipedia.
The sceintific 4th dimention is, as Zeddicus said, time
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There are three conventional spatial dimensions: length (or depth), width, and height, often expressed as x, y and z. x and y axes appear on a plane Cartesian graph and z is found in functions such as a "z-buffer" in computer graphics, for processing "depth" in imagery. The fourth dimension is often identified with time, and as such is used to explain space-time in Einstein's theories of special relativity and general relativity. When a reference is used to four-dimensional co-ordinates, it is likely that what is referred to is the three spatial dimensions plus a time-line. If four (or more) spatial dimensions are referred to, this should be stated at the outset, to avoid confusion with the more common notion that time is the Einsteinian fourth dimension.
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Source= Wikipedia
I know its a bit to far and over... erm.... geeky but....... Thoughts?