Pronunciation: (i-fek'tiv),[key] —adj. 1. adequate to accomplish a purpose; producing the intended or expected result: effective teaching methods; effective steps toward peace. 2. actually in operation or in force; functioning: 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.
—n. 1. a member of the armed forces fit for duty or active service.
2. the effective total of a military force.