1.producing or capable of producing an intended result or having a striking effect;
an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation-LewisMumford
2.able to accomplish a purpose; functioning effectively;
people who will do nothing unless they get something out of it for themselves are often highly effective persons...-G.B.Shaw
3.works well as a means or remedy;
an effective reprimand
4.exerting force or influence;
the law is effective immediately
5.existing in fact; not theoretical; real;
a decline in the effective demand
6.equipped and ready for service;
the fort was held by about 100 effective soldiers