Brainwave (noun)

1. An electrical impulse or pattern of impulses in the brain.
2. An idea or sudden insight.

Origin:

A combination of the words "brain" and "wave", referring to the electrical impulses in the brain that can be measured by an electroencephalogram (eeg).

Examples:

1. The scientist studied the brainwaves of sleep-deprived individuals.
2. His sudden realization was a brainwave that solved the problem.
3. The brainwaves of the meditating monk showed a pattern of calm and focus.
4. The invention of the telephone was a brilliant brainwave.
5. The brainwave of using a computer to predict the weather was a game changer.