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effectiveness

/ɪˈfɛk.tɪv.nɪs/ noun B2
  1. The property of being effective, of achieving results. (countable, uncountable) · The effectiveness of the drug was well established.
  2. The capacity or potential for achieving results. (countable, uncountable)
  3. The degree to which something achieves results. (countable, uncountable) · He questioned the effectiveness of the treatment.

Plural effectivenesses

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.