There are some discussions on more than one time dimensions, e.g., Intuition for multiple temporal dimensions and More than one time dimension.
If we define that the parallel direction is time, of course, we can have only one time dimension but multiple space dimensions.
Then, the questions are:
Q1. Is the above definition reasonable?
Q2. If not, then why time is so different from space? And, how we define time?
Q3. Is multiple time dimensions possible? For example, are there any GUT support it?
Q4. If not, why only one time dimension? Or, which principle rules multiple time dimensions out?
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