from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A nonnegative integer that specifies the magnitude of the spin angular momentum vector of a subatomic particle.
- noun An integer that specifies the direction of the spin angular momentum vector of a subatomic particle.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics A
quantum numberthat specifies the spinof a particle; for an electron, it may only take the values ±1/2
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