I often hear people refer to subtler layers of existence as other “dimensions.” As a dimension is a direction in space, this is a poor term to use.
It also gets muddy really fast. For example, if we call the astral another dimension, we’re suggesting it’s a line, a kind of squashed Flatland, not an open space. We’d have to give it 2 more dimensions to match the physical. Same with all the other layers. And yet this implies they’re all separate spaces.
It can certainly seem like subtler levels are distinct spaces (lokas or worlds) at first. This is like being inside an office tower. As we notice other floors, we may think of them as distinct. But as we become aware of the tower as a whole, then we know other floors are just layers in one space.
However, even science has confused the map with the road. We developed the famous X-Y-Z axes to graph space in 3 dimensions. This makes some sense for a person walking along the ground. There’s up and down and forward and backward and side to side. 3D.
But what does this mean in outer space? What is up? It changes as you turn.
In Synergetics, Buckminster Fuller proposed using 4D space based on the tetrahedron rather than the 3D cube. He said this better mapped the flow of action and it eliminated the need for imaginary and irrational numbers. It would be interesting to know what he thought of current physics models using “folded” dimensions to explain the world. Perhaps physicists are being a little too material and not accounting for subtler levels.
In any case, keep in mind that dimensions are a way to model our experience. Infinite space doesn’t have an up. Understanding that dimension is just a direction in space, there are an infinite number of possible dimensions. Think of it more like in and out. There are also an infinite number of points to define as “in.” Here for you differs from here for me.
Equally, time is not a dimension. It’s an effect of the process of experience. This is why we experience time differently in different circumstances. (assuming you’re not identified with clock time)
There is great value in using models to get a sense of the world and our place in it. But be careful not to confuse the model with the reality.