Noun
1. an instinctive motive;
"profound religious impulses"2. a sudden desire;
"he bought it on an impulse"3. the electrical discharge that travels along a nerve fiber;
"they demonstrated the transmission of impulses from the cortex to the hypothalamus"4. (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"5. the act of applying force suddenly;
"the impulse knocked him over"6. an impelling force or strength;
"the car's momentum carried it off the road"