||Based on random choice or personal whim, rather than any reason or system
||“Arbitrary” is a modifier (adjective) to a kind-of-quantity.
||Arbitrary indicates that the kind-of-quantity is outside the International System of Quantities, i.e., as for kind-of-property. The corresponding measurement unit to the arbitrary kind-of-quantity has no dimension within the SI measurement unit.
||Ferard G, Dybkaer R, Fuentes-Arderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. doi:10.1039/9781782622451.