What is MOLE?

MOLE meaning in Science terminology / glossary / dictionary is:
It is SI unit of amount of substance. The mole is defined as the quantity of substance of a system that contains the same number of elementary entities (atoms, molecules, ions, electrons or particles, depending on the substance) as there are atoms in 0.012 kilograms of pure, unbound carbon-12; this number is approximately equal to 6.02214199?10^23.