noun

effectiveness

ih-FEHK-tihv-nihs

noun

The degree to which something achieves the result it is meant to.

"Studies measured the effectiveness of the new vaccine."

"The coach questioned the effectiveness of the team's defensive strategy."

How to Use Effectiveness

Learner’s notes

In plain EnglishHow well something actually works at doing what it's supposed to do.

Common pairings

proven effectiveness measure effectiveness question the effectiveness

effectivenesses plural

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Studies measured the _____ of the new vaccine.

Formed from effective plus the noun-forming suffix "-ness."

oneness likeness idleness lateness rudeness niceness cuteness awareness whiteness closeness politeness gentleness