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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.

A new study has provided the first comprehensive estimate of koala numbers in the region and identified a humane, cost effective strategy to keep the population at sustainable levels.

From Science Daily • Jun. 8, 2026

"As our understanding of these compounds grows, there is a real opportunity to make dietary guidance more specific and more effective."

From BBC • Jun. 8, 2026

The drug was also effective in relieving obesity-linked conditions, including knee pain, sleep apnea and type 2 diabetes, the company said.

From The Wall Street Journal • Jun. 8, 2026

Yet, numerous studies over the past decade have determined that paracervical blocks are highly effective at reducing pain during the procedure.

From Slate • Jun. 7, 2026

As more effective procedures were developed, surgery and wound treatment became safer.

From "Ambushed!" by Gail Jarrow




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