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Dimensions are the way we see, measure and experience our world,
by using up and down, right to left, back to front, hot and cold, how heavy and how long,
as well as more advanced concepts from mathematics and physics.

One way to define a dimension is to look at the degrees of freedom,
or the way an object can move in a specific space.
There are different concepts or ways where the term dimension is used,
and there are also different definitions.
There is no definition that can satisfy all concepts.

https://simple.wikipedia.org/wiki/Dimension