1) Flatness 2) Linearity 3) Planeness 1) Spatial property 2) Spatiality 
The combination of basic dimensions associated with a physically significant quantity. These dimensions are those of mass M, length L, and time T and any combinations of their powers. For instance, momentum has dimensions of mass × velocity (MLT -1) and energy has the dim...
[n] - the spatial property of having dimensions
noun the spatial property of having dimensions; `all matter has dimensionality`