In physics, quantum is used to refer to the smallest amount of a physical quantity that can exist independently. It is especially used when referring to a discrete quantity of electromagnetic radiation.
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what does quantum mean
NOUN [PLURAL QUAN·TA]
quantity or amount: the least quantum of evidence.
a particular amount.
a share or portion.
a large quantity; bulk.
sudden and significant: a quantum increase in productivity.
Quantum means the amount. Quantum, in Physics, means the tiniest amount of radiant energy. It is equal to Planck's constant multiplied by the frequency associated with radiation. You can find more information here: http://dictionary.reference.com/browse/quantum