- adequate to accomplish a purpose; producing the intended or expected result: effective teaching methods; effective steps toward peace.
- actually in operation or in force; functioning: The law becomes effective at midnight.
- producing a deep or vivid impression; striking: an effective photograph.
- prepared and available for service, especially military service.
- a member of the armed forces fit for duty or active service.
- the effective total of a military force.
Origin of effective
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for effective
He could deliver a quick, effective speech, or hold a proper press conference.Obama’s Pot Policy Is Refer Madness
January 5, 2015
If the embargo were effective, the Castro brothers would have been doing Love Letters with the Duvaliers years ago.Obama’s One Hand Clap With Castro
December 24, 2014
Build evidence about the practices, policies, and programs that will achieve the most effective and efficient results.Can the U.S. Government Go Moneyball?
Peter Orszag, Jim Nussle
December 23, 2014
While there are a couple of antibiotics that usually work, if they are overused they, too, may cease to be effective.Without Education, Antibiotic Resistance Will Be Our Greatest Health Crisis
December 19, 2014
In order to know what innovations work, you have to have good information on how effective your practices are.Your Local School Doesn’t Have to Suck
Michael S. Roth
December 17, 2014
And, for the unaesthetic but effective Attila, an able fashioner of pork products from Chicago.The Spenders
Harry Leon Wilson
In the last few meetings he had held he had found this an effective beginning.In the Midst of Alarms
But when he left argument and came back to experience he was most effective.Understanding the Scriptures
And that was the one thing which was most effective in restoring Katy's nerves.Her Father's Daughter
Her tone is pure, her morals are high, her teachings are direct and effective.The Boy Life of Napoleon
- productive of or capable of producing a result
- in effect; operativeeffective from midnight
- producing a striking impression; impressivean effective entrance
- (prenominal) actual rather than theoretical; realthe effective income after deductions
- (of a military force, etc) equipped and prepared for action
- physics (of an alternating quantity) having a value that is the square root of the mean of the squares of the magnitude measured at each instant over a defined period of time, usually one cycleSee also root mean square
- a serviceman who is equipped and prepared for action
Word Origin and History for effective
late 14c., from French effectif, from Latin effectivus "productive, effective," from effect-, stem of efficere (see effect (n.)). Effectively in the sense of "actually" is attested by 1650s. Related: Effectivity.