- 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 for effective on Thesaurus.com
Examples from the Web for effectiveness
Ever since it was created in 1965, politicians and researchers have studied and debated its effectiveness.Can the U.S. Government Go Moneyball?
Peter Orszag, Jim Nussle
December 23, 2014
The culture of promotion through seniority kills creativity and effectiveness.Your Local School Doesn’t Have to Suck
Michael S. Roth
December 17, 2014
The trouble comes from overconfidence in their effectiveness.Kids Eat the Darndest Things: Laundry Pods, Teething Necklaces, and More Of The Weirdest Stuff Sending Kids to the E.R.
November 14, 2014
William Lloyd Garrison was probably the most prominent leader who relied on the effectiveness of hellfire.
The effectiveness of these pamphlets, and the awareness of its writers are apparent in one Lum digs up called “To Mothers.”
The summary of a lesson, given by the class, is a test of the effectiveness of instruction.College Teaching
Their help is essential to ensure the effectiveness of the exorciser's task.The Religion of Babylonia and Assyria
But this result only added to the effectiveness of the scene, though it was painful.The Moving Picture Girls in War Plays
Laura Lee Hope
The face is that of an aloof and sunny spirit, full of energy and effectiveness.William Shakespeare
But force of habit had utterly dulled its effectiveness as a weapon.The Sign of the Spider
- 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 effectiveness
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.