ef•fec•tive^*ɪˈfɛk tɪv(adj.)

1. adequate to accomplish a purpose; producing the intended or expected result:

   effective teaching methods.

2. in operation or in force; functioning; operative:

   The law becomes effective at midnight.

3. producing a deep or vivid impression; striking:

   an effective photograph.

4. prepared and available for service, esp. military service.

   Category: Military

5. (n.)a member of the armed forces fit for duty or active service.

   Category: Military

^* Syn: effective , effectual , efficacious , efficient refer to that which produces or is able to produce an effect. effective is applied to something that produces a desired or expected effect, often a lasting one: an effective speech. effectual usu. refers to something that produces a decisive outcome or result: an effectual settlement. efficacious refers to something capable of achieving a certain end or purpose: an efficacious remedy. efficient , usu. used of a person, implies skillful accomplishment of a purpose with little waste of effort: an efficient manager.

Origin of effective:

1350–1400; ME < L effectīvus=effect(us), ptp. of efficere (see effect ) +-īvus -ive

ef•fec′tive•ness(n.)

ef•fec•tiv′i•ty(n.)