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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:

It turned out to be an extraordinarily effective — but expensive — demonstration of why due process exists.

From Salon Aug. 25, 2026

Canadian Prime Minister Mark Carney said retaliatory tariffs would be effective September 8, as analysts warn of tit-for-tat escalation.

From Barron's Aug. 25, 2026

Officials said that effective Sept. 8, or the day after Labor Day, Canada plans to place tariffs ranging between 15% and 50% on about $20 billion of goods, or roughly 7% of total U.S. imports.

From The Wall Street Journal Aug. 25, 2026

Public health experts worry the order will cause confusion about an already safe and effective vaccine and prove costly.

From BBC Aug. 25, 2026

As head of the SIS and Yardley’s effective successor, William was closely watched.

From "The Woman All Spies Fear" by Amy Butler Greenfield




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