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IMPULSE

Definition:

[noun] an instinctive motive; "profound religious impulses"
Synonyms: urge
[noun] a sudden desire; "he bought it on an impulse"
Synonyms: caprice, whim
[noun] the electrical discharge that travels along a nerve fiber; "they demonstrated the transmission of impulses from the cortex to the hypothalamus"
Synonyms: nerve
[noun] (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"
Synonyms: pulsation, pulsing, pulse
[noun] the act of applying force suddenly; "the impulse knocked him over"
Synonyms: impulsion, impetus
[noun] an impelling force or strength; "the car's momentum carried it off the road"
Synonyms: momentum