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Definitions

effective

[ih-fek-tiv, ee-fek‐] / ɪˈfɛk tɪv, iˈfɛk‐ /




Usage

What are other ways to say effective? The adjective effective is applied to a person or a thing that has the power to, or which actually does, produce an effect: an effective boss, remedy, speech. Effectual is used especially of that which produces the effect desired or intended, or a decisive result: An effectual bombardment silenced the enemy. Efficacious suggests the capability of achieving a certain end: an efficacious plan, medicine. Efficient (applied also to persons) implies the skillful use of energy or industry to accomplish desired results with little waste of effort: efficient methods; an efficient manager. 

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

The most effective protection against measles is two doses of the measles-mumps-rubella vaccine, health officials said.

From Los Angeles Times Aug. 2, 2026

"Instead of relying solely on high-frequency exercise prescriptions, once-weekly interval training can be considered a feasible and effective alternative," added Professor Siu.

From Science Daily Aug. 2, 2026

Generally, BBC Verify's tests have found this is effective with images generated by the new feature.

From BBC Jul. 31, 2026

“I wish they were more popular. It’s really hard to get education out there on healthcare benefits. There’s no effective way that showcases how to make good use of those funds,” Walsh said.

From MarketWatch Jul. 31, 2026

“There can be no justification or military grounds for refusing any further to employ what promises to be our most effective weapon,” Admiral Alfred von Tirpitz declared.

From "The War to End All Wars: World War I" by Russell Freedman




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