Neil deGrasse Tyson breaks my mind...again!

The 4th dimension is often considered to be time.
They don't really have an order. In our world, we have one timelike dimension and 3 spatial dimensions. A four dimensional space would have 4 spatial dimensions and presumably a time dimension.

But of course, we can talk about any number of dimensions. String theory has as many as 27 dimensions, no less than two of which are time.
 
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