The property or quality of having dimensions; in mathematics and physics, the number of independent directions or coordinates needed to specify a point in space.
From 'dimension' (Latin 'dimensio,' a measuring) + '-ality' (quality or state). Modern mathematical term solidified in 20th-century physics and computer science.
Dimensionality is why physicists can talk about 10-dimensional string theory—it's just asking 'how many directions do we need to map this space?'—and the answer can be mind-bendingly high!
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