[n] the act of applying force suddenly; "the impulse knocked him over"
[n] an impelling force or strength; "the car's momentum carried it off the road"
[n] the electrical discharge that travels along a nerve fiber; "they demonstrated the transmission of impulses from the cortex to the hypothalamus"
[n] (electronics) a sharp transient wave in the normal electrical state (or a series of such transients); "the pulsations seemed to be coming from a star"
[n] a sudden desire; "he bought it on impulse"
[n] an instinctive motive; "profound religious impulses"
caprice, impetus, impulsion, momentum, nerve impulse, pulsation, pulse, pulsing, urge, vagary, whim