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impulse
1: a wave of excitation transmitted through tissues and especially nerve fibers and muscles that results in physiological activity or inhibition2 a: a sudden spontaneous inclination or incitement to some usually unpremeditated action <some uncontrollable impulse…may have driven the defendant to the commission of the murderous act — B. N. Cardozo> b: a propensity or natural tendency usually other than rational <the fundamental impulse of self-expression — Havelock Ellis>
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