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The HasDimension(dim) function returns true if there is a dimension with the name dim. Otherwise, false is returned.

$\mathrm{with}\left(\mathrm{Units}\right)\:$

Automatically loading the Units[Simple] subpackage

$\mathrm{HasDimension}\left('\mathrm{length}'\right)$

$\mathrm{true}$

$\mathrm{HasDimension}\left('\mathrm{speed}'\right)$

$\mathrm{true}$

$\mathrm{HasDimension}\left('\mathrm{acceleration}'\right)$

$\mathrm{true}$

$\mathrm{HasDimension}\left('\mathrm{surge}'\right)$

$\mathrm{false}$

$\mathrm{AddDimension}\left('\mathrm{surge}'=\frac{'\mathrm{length}'}{{'\mathrm{time}'}^3}\right)$

$\mathrm{HasDimension}\left('\mathrm{surge}'\right)$

$\mathrm{true}$