Definition of quantum
plural quanta play \'kwän-t?\
1
a :quantity, amount
b :portion, part
c :gross quantity :bulk
2
a :any of the very small increments or parcels into which many forms of energy are subdivided
b :any of the small subdivisions of a quantized physical magnitude (such as magnetic moment)
“The ideas of debtor and creditor as to what constitutes a good time never coincide," P.G. Wodehouse, Love Among the Chickens