1.a phenomenon that follows and is caused by some previous phenomenon;
the magnetic effect was greater when the rod was lengthwise
2.an outward appearance;
he made a good impression
3.(of a law) having legal validity;
the law is still in effect
4.a symptom caused by an illness or a drug;
the effects of sleep loss
5.an impression (especially one that is artificial or contrived);
he just did it for effect
6.the central meaning or theme of a speech or literary work
1.produce;
The scientists set up a shockwave
2.act so as to bring into existence;
effect a change