What is the meaning of effect?

noun

• A phenomenon that follows and is caused by some previous phenomenon.
  • usage: "the magnetic effect was greater when the rod was lengthwise"; "his decision had depressing consequences for business"; "he acted very wise after the event"
  • synonyms: consequence, outcome, result, event, issue, upshot
• An outward appearance.
  • usage: "he made a good impression"; "I wanted to create an impression of success"; "she retained that bold effect in her reproductions of the original painting"
  • synonyms: impression
• An impression (especially one that is artificial or contrived. )
  • usage: "he just did it for effect"
• The central meaning or theme of a speech or literary work.
  • synonyms: essence, burden, core, gist
• Of a law. ( having legal validity)
  • usage: "the law is still in effect"
  • synonyms: force
• A symptom caused by an illness or a drug.
  • usage: "the effects of sleep loss"; "the effect of the anesthetic"

verb

• Produce.
  • usage: "The scientists set up a shock wave"
  • synonyms: effectuate, set up
• Act so as to bring into existence.
  • usage: "effect a change"