at its most fundamental, a "dimension" is just something which can be measured. think eharmony and its 29 dimensions of compatibility. a cube can be measured in 3 dimensions, length, width, height. those are spatial dimensions. time is the dimension involved with the measurement of movement. you can measure the spatial dimensions of an object for which you have a single still frame picture, and if you have multiple frames (as in a video) you can measure movement (or the lack thereof), which is the time dimension. this mirrors the way that you can measure the height dimension of a 3d object by stacking cross-sections. checked back in since santa woke me up, but i'm going back to bed. hope this helps though
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