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RE:Time?
In physics, when we say that time is a dimension, it is not an arbitrary attribution. When Relativity Theory appeared, it took some time to someone propose that time could be viewed as a dimension. The first who realized it and coined the expression spacetime was Minkowski. In Relativity, time and space are entangled in a very special way: both together define the metric of the spacetime. It may seem just words without meaning, but the metric of the space is what gives the gravitational force in General Relativity. So, the issue of being or not a dimension is something very deep and not just a matter of convention. Of course there is the mathematical meaning of dimension, but it is another story...
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