Physics. radiation emitted as a consequence of a previous absorption of radiation.
Radio. retransmission of signals, a source of interference, due to frequency oscillations in a radio receiver.

1880–85; re- + radiation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reradiation (ˌriːreɪdɪˈeɪʃən)
radiation resulting from the previous absorption of primary radiation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
If that happens, the whole process of absorption and reradiation starts again.
Long wave reradiation can warm the atmosphere by warming clouds.
In a fire, foam acts as a barrier to radiant energy including reradiation from the fire.
Cirrus and nimbus clouds provide markedly different types of radiation attenuation and atmospheric reradiation.
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