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.
- ef·fec·tive·ly, adverb
- ef·fec·tive·ness, ef·fec·tiv·i·ty [ih-fek-tiv-i-tee, ee-fek-] /ɪˌfɛkˈtɪv ɪ ti, iˌfɛk-/ noun
- pre·ef·fec·tive, adjective
- qua·si-ef·fec·tive, adjective
- sub·ef·fec·tive, adjective
- su·per·ef·fec·tive, adjective
- un·ef·fec·tive, adjective
- affective, effective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use effective in a sentence
He could deliver a quick, effective speech, or hold a proper press conference.
If the embargo were effective, the Castro brothers would have been doing Love Letters with the Duvaliers years ago.
Build evidence about the practices, policies, and programs that will achieve the most effective and efficient results.
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 | Russell Saunders | December 19, 2014 | THE DAILY BEAST
In order to know what innovations work, you have to have good information on how effective your practices are.
Whatever can be done to bring about the prompt and effective use of this new system of bank settlement will be done.Readings in Money and Banking | Chester Arthur Phillips
It is a notable fact that under the wholly unusual circumstances prevailing, the recovery was so prompt and effective.Readings in Money and Banking | Chester Arthur Phillips
However able the matter, the reading, in my judgment, is much less effective than the spontaneous expression of the speaker.Fifty Years of Railway Life in England, Scotland and Ireland | Joseph Tatlow
Thus they had secured a monopoly in Munster and an effective competition with us in poor Connaught.Fifty Years of Railway Life in England, Scotland and Ireland | Joseph Tatlow
It was ten minutes before she raised her hand and pointed to a wilted but still effective screen.Ancestors | Gertrude Atherton
British Dictionary definitions for effective
productive of or capable of producing a result
in effect; operative: effective from midnight
producing a striking impression; impressive: an effective entrance
(prenominal) actual rather than theoretical; real: the 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 cycle: See also root mean square
a serviceman who is equipped and prepared for action
- effectively, adverb
- effectiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012