Definition of "effectiveness" []

• The property of being effective (noun)
• The ability to be effective. (noun)
• The degree to which something is effective. (noun)

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• "I think that any small drop in effectiveness is more than countered by the benefits of open, realistic government."
• "Research, such as that by William Sanders and Eric Hanushek, shows that teacher effectiveness is the most important in-school factor affecting student learning."
• "But the key to their effectiveness is their rattle, and it's not just the noise, but also how it is made."