Return a description of the given dimensionality, using the defintion of this
| long dim | unsigned | the packed dimensionality of the quantity to be described |
| lengthUnitSet | optional unit set | The name or ID of a unit set, or a pointer to a UnitSet object. Only used by dimensions that have a non-zero value for 'perLength'. This allows the return of values such as "mm˛/m" |
| Return value | string | the returned description |
See also packDimensionality
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