definition of a surge
surge surge. 1. a strong, wavelike forward movement, rush, or sweep: the surge of the crowd. 2. a sudden, strong rush or burst: a surge of energy. 3. a strong, swelling, wavelike volume or body of something. 4. the rolling swell of the sea. 5. a swelling wave; billow. 6. the swelling and rolling sea. 7. a. a sudden rush or burst of electric current or voltage. b. a violent oscillatory disturbance.