iˈfɛktʃuəl ɛf.ɪ.ˈkeɪ.ʃəs ˈliː.ɡəl ˈliɡəl 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 effective teaching methods effective steps toward peace made an effective entrance his complaint proved to be effectual in bringing action an efficacious law having legal efficacy or force a sound title to the property