- an electrical impulse given off by brain tissue, occurring at a frequency that varies according to mental state or activity, such as the slow waves associated with deep sleep and the fast waves associated with actively engaged thoughts and speech.
- a sudden idea or inspiration; brainstorm.
- a sudden inspiration or idea
- any of the fluctuations of electrical potential in the brain as represented on an electroencephalogram. They vary in frequency from 1 to 30 hertz
