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Dictionary.com Unabridged (v 1.1)Cite This Source
al·lowed    Audio Help   [uh-loud] Pronunciation Key
–adjective
Physics. involving a change in quantum numbers, permitted by the selection rules: allowed transition.
[Origin: allow + -ed2]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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