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selah
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seldom
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selection rule
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selection rule
se·lec·tion rule (plural se·lec·tion rules)


noun 
Definition:
 
rule governing changes in quantum system: a rule derived from quantum mechanics that governs whether changes may or may not occur in quantized systems such as molecules, atoms, or nuclei
Encarta® World English Dictionary [North American Edition] © & (P)2007 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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