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What is the plural of effectiveness?

What's the plural form of effectiveness? Here's the word you're looking for.

Answer

The noun effectiveness can be countable or uncountable.

In more general, commonly used, contexts, the plural form will also be effectiveness.

However, in more specific contexts, the plural form can also be effectivenesses e.g. in reference to various types of effectivenesses or a collection of effectivenesses.

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Examples
The review questioned the effectiveness of harsh interrogation methods employed by CIA interrogators, such as waterboarding.
Goss defines military effectiveness as the fulfillment of assigned missions and the accomplishment of political objectives.
The soft-ware applications in the library continue to be used to increase safety for the warfighter and ensure combat effectiveness.
Without their support there would be a major question mark over the effectiveness of unilateral action.
Periodic remeasures can validate the effectiveness of the intervention plan.
I want each of you to understand that mission accomplishment means both war-fighting effectiveness and resourcefulness.

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