Definitions of effect:

• noun:   (of a law) having legal validity

  Example: "The law is still in effect"

• noun:   an impression (especially one that is artificial or contrived)

  Example: "He just did it for effect"

• noun:   the central meaning or theme of a speech or literary work
• noun:   a symptom caused by an illness or a drug

  Example: "The effects of sleep loss"

• noun:   an outward appearance

  Example: "She retained that bold effect in her reproductions of the original painting"

• noun:   a phenomenon that follows and is caused by some previous phenomenon

  Example: "The magnetic effect was greater when the rod was lengthwise"

• verb:   act so as to bring into existence

  Example: "Effect a change"

• verb:   produce