Definition of "brainwave" [brain•wave]

• Any of many rhythmic fluctuations of electric potential between parts of the brain, especially those seen on an electroencephalogram (noun)
• A sudden idea, understanding, or inspiration; a brainstorm (noun)

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• ""It was a sort of second-sight -- what they call a brainwave," Nick smiled."
• "Sometimes the 'brainwave' is not unlike opportunity-something simple which is frequently missed because it goes around disguised as hard work."
• "- – As of current, hypergraphia is understood to be triggered by changes in brainwave activity in the temporal lobe."