A Mole

(chemistry, physics) In the International System of Units, the base unit of amount of substance; the amount of substance of a system which contains as many elementary entities (atoms, ions, molecules, etc.) as there are atoms in 0.012 kg of carbon-12. Symbol: mol. The number of atoms is known as Avogadro’s number. [from 1897]<p>Synonyms</p><p>gram molecule</p>