Thank you.
So which of those three (or four) dimensions is the third? 'Three dimensions' is plural, whereas 'third' is singular e.g. in a marathon there's only one third place.
The concept 'third dimension' implies a sequential order of dimensions: 1, 2, 3, 4, 5 etc.
So:
Is there a relationship between the sequential order and the number of spatial dimensions in a given dimension e.g. the first dimension = 1D etc.?
If so, then how does that work? Was the third dimension created with the introduction of depth (which you might logically say is the third spatial dimension)? Before this dimension came into being was there only height and width? And so on? And where does time fit into it? As you said, some people regard time as the 4th dimension.
If not, then how does anyone know this is the 'third' dimension? For all we know it could be the 86th dimension. Has someone managed to count them and determine the correct order? How many dimensions are there? What was their methodology? Questions abound.
There's probably something obvious I've missed. Hoping you guys might be able to shed some light.
Thanks in advance.