effective: Meaning and Definition of

ef•fec•tive

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.

1. a member of the armed forces fit for duty or active service.
2. the effective total of a military force.