Mathematically, you can have as many dimensions as you want. Our "real world" seems to have only 3 dimensions. While there are speculations that other universes - or parts of our Universe - may have more or less dimensions, for now, these are just speculations. According to string theory, our Universe actually has 10 or 11 dimensions, but only 3 of those appear on a large scale - the others will only have an effect on very, very tiny scales.
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