The definition of an impulse is a strong urge or unexplainable urge.
(noun)See impulse in Webster's New World College Dictionary
noun
Origin: L impulsus < pp. of impellere: see impel
See impulse in American Heritage Dictionary 4
noun
Origin:
Origin: Latin impulsus
Origin: , from
Origin: past participle of impellere, to impel; see impel
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