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Noun effectiveness has 2 senses
  1. effectiveness, effectivity, effectualness, effectuality - power to be effective; the quality of being able to bring about an effect
    --1 is a kind of power, powerfulness
    Antonyms: ineffectiveness, ineffectualness, ineffectuality
    --1 has particulars: incisiveness, trenchancy; efficacy, efficaciousness
  2. potency, effectiveness, strength - capacity to produce strong physiological or chemical effects; "the toxin's potency"; "the strength of the drinks"
    --2 is a kind of power, powerfulness
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