brainwave

World English Dictionary
brainwave (ˈbreɪnˌweɪv)
 
n
informal Also called: brainstorm a sudden inspiration or idea

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
brainwave

noun
1. (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph 
2. the clear (and often sudden) understanding of a complex situation [syn: insight
WordNet® 3.0, © 2006 by Princeton University.
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