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effective

[ ih-fek-tiv, ee-fek‐ ]
/ ɪˈfɛk tɪv, iˈfɛk‐ /
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See synonyms for: effective / effectively / effectiveness on Thesaurus.com

adjective

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.

noun

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

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Origin of effective

First recorded in 1350–1400; Middle English from Latin effectīvus “practical,” equivalent to effect(us), past participle of efficere (see effect) + -īvus adjective suffix (see -ive)

synonym study for effective

2. operative. 3. telling.

OTHER WORDS FROM effective

WORDS THAT MAY BE CONFUSED WITH effective

affective, effective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use effective in a sentence

British Dictionary definitions for effective

effective
/ (ɪˈfɛktɪv) /

adjective

noun

a serviceman who is equipped and prepared for action

Derived forms of effective

effectively, adverbeffectiveness, 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
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