Definitions:

1. able to accomplish a purpose adjective
   • functioning effectively
2. exerting force or influence adjective
   • the law is effective immediately
3. producing or capable of producing an intended result or having a striking effect adjective
   • an aircooled motor was more effective than a witch's broomstick for rapid longdistance transportationLewisMumford
4. ready for service adjective
   • the fort was held by about 100 effective soldiers
5. works well as a means or remedy adjective
   • an effective reprimand

Synonyms:

• effectual
• efficacious
• efficient
• good
• in effect
• in force

NearBy Words:

• effectively
• effectiveness