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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 jab is not effective at preventing the transmission of bacteria between people.

From BBC • Jun. 12, 2026

The most effective antipoverty work usually happens when people in local parishes tackle local problems.

From The Wall Street Journal • Jun. 11, 2026

It’s most effective if your medical provider helps with the process, says Julie Carter, counsel for federal policy at the Medicare Rights Center, an advocacy group.

From Barron's • Jun. 11, 2026

This expands current understanding of why mitochondria become less effective over time and highlights membrane lipid dynamics as another important factor in the aging process.

From Science Daily • Jun. 11, 2026

She pulled off her glasses like it might make the lasers shooting from her eyes more effective.

From "Millionaires for the Month" by Stacey McAnulty




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