Why are ordered lists considered one dimensional?
The specific ordering is only metadata as it is not explicitly in the data itself, and the index doesn't always represent order.
If you have an additional row with the order in then it would be two dimensional. But, for example, you wouldn't be able to distinguish between ascending and descending order by looking at the index itself.
v(t) is velocity by time
data[index] is data point by location in a data object (rather than known order).
Perhaps you could argue that the index is a second dimension, but consider this, how would you represent 1D data in a computer otherwise?