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quan•tum



Pronunciation: (kwon'tum), [key]
n., pl. -taPronunciation: (-tu), [key]
adj.


n.
1. quantity or amount: the least quantum of evidence.
2. a particular amount.
3. a share or portion.
4. a large quantity; bulk.
5. Physics.
a. the smallest quantity of radiant energy, equal to Planck's constant times the frequency of the associated radiation.
b. the fundamental unit of a quantized physical magnitude, as angular momentum.

adj.
sudden and significant: a quantum increase in productivity.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Quantrillquantum chemistry
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