| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024im•pulse /ˈɪmpʌls/USA pronunciation n. - the influence of a particular feeling, etc., to do something:[countable]a sudden impulse to quit his job.
- sudden desire leading to action:[uncountable]swayed by impulse.
- [countable] a pushing force that causes motion.
- Electricity a single, usually sudden, flow of electric current or signal from the nerves to a muscle, in one direction:[countable]to send out radio impulses that are picked up by the circling aircraft.
See -puls-. WordReference Random House Unabridged Dictionary of American English © 2024im•pulse (im′puls),USA pronunciation n. - the influence of a particular feeling, mental state, etc.:to act under a generous impulse; to strike out at someone from an angry impulse.
- sudden, involuntary inclination prompting to action:to be swayed by impulse.
- an instance of this.
- Psychologya psychic drive or instinctual urge.
- an impelling action or force, driving onward or inducing motion.
- the effect of an impelling force;
motion induced;
impetus given. - Physiologya progressive wave of excitation over a nerve or muscle fiber, having either a stimulating or inhibitory effect.
- Mechanicsthe product of the average force acting upon a body and the time during which it acts, equivalent to the change in the momentum of the body produced by such a force.
- Electricitya single, usually sudden, flow of current in one direction.
adj. - marked by or acting on impulse:an impulse buyer.
- bought or acquired on impulse:To reduce expenses, shun impulse items when shopping.
- Latin impulsus pressure, impulse, equivalent. to im- im-1 + pul- (variant stem of pellere to push) + -sus, variant of -tus suffix of verb, verbal action
- 1640–50
Collins Concise English Dictionary © HarperCollins Publishers:: impulse /ˈɪmpʌls/ n - an impelling force or motion; thrust; impetus
- a sudden desire, whim, or inclination
- an instinctive drive; urge
- tendency; current; trend
- the product of the average magnitude of a force acting on a body and the time for which it acts
- the change in the momentum of a body as a result of a force acting upon it for a short period of time
- See nerve impulse
- on impulse ⇒ spontaneously or impulsively
Etymology: 17th Century: from Latin impulsus a pushing against, incitement, from impellere to strike against; see impel |