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Definitions

effectiveness

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




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.

Despite doubts about their effectiveness, Minicircle’s gene therapy and others like it are available at an increasing number of clinics across the world.

From Slate • Mar. 30, 2026

How he overcame his only moment of real peril underlined the effectiveness of his serve.

From BBC • Mar. 30, 2026

Users hit back at Papperger's comments with jokes and memes highlighting the effectiveness of Ukrainian drones and anti-drone defences.

From Barron's • Mar. 29, 2026

This research shows that effectiveness depends not only on whether a drug reaches a tumor, but also on how it spreads within it and inside individual cells.

From Science Daily • Mar. 27, 2026

Lupita let out a deep sigh of sadness, asking herself if even the effectiveness of hard work could be trusted.

From "Lupita Mañana" by Patricia Beatty