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TOEFL BNC: 3478 COCA: 3543
effectiveness
noun [U] /ɪˈfektɪvnəs/
  1. the degree to which something works well and produces the result that was intended

    The effectiveness of this drug was checked through clinical trials.

    These recommendations are aimed at improving effectiveness and efficiency.

     Synonyms and related words
    Usefulness and efficiency:usefulness, efficiency, effectiveness...

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