What is the meaning of effective?

adjective

• Producing or capable of producing an intended result or having a striking effect.
  • usage: "an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation-LewisMumford; "effective teaching methods"; "effective steps toward peace"; "made an effective entrance"; "his complaint proved to be effectual in bringing action"; "an efficacious law"
  • synonyms: effectual, efficacious
• Able to accomplish a purpose; functioning effectively.
  • usage: "people who will do nothing unless they get something out of it for themselves are often highly effective persons...-G. B. Shaw; "effective personnel"; "an efficient secretary"; "the efficient cause of the revolution"
  • synonyms: efficient
• Works well as a means or remedy.
  • usage: "an effective reprimand"; "a lotion that is effective in cases of prickly heat"
• Exerting force or influence.
  • usage: "the law is effective immediately"; "a warranty good for two years"; "the law is already in effect (or in force)"
  • synonyms: good, in effect, in force
• Existing in fact; not theoretical; real.
  • usage: "a decline in the effective demand"; "confused increased equipment and expenditure with the quantity of effective work done"
• Ready for service.
  • usage: "the fort was held by about 100 effective soldiers"