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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.

The transit technique, which is expected to uncover roughly 100,000 worlds, is particularly effective at detecting large, extremely hot planets.

From Science Daily • Jun. 1, 2026

“Consequently, there is an urgent need for more effective treatment approaches that provide durable benefit for a greater number of patients.”

From MarketWatch • Jun. 1, 2026

"To ensure the safety and well-being of all residents, a mandatory curfew for a half-mile area surrounding Delaney Hall is being implemented, effective immediately," Newark Mayor Ras Baraka said in a statement.

From Barron's • May 31, 2026

Shankland ran everywhere apart from where he is most effective.

From BBC • May 30, 2026

Besides, it turned out that they also were incredibly effective fundraising tools.

From "Night Owls" by A.R. Vishny




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