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Noun: effectiveness  i'fek-tiv-nus
  1. Power to be effective; the quality of being able to bring about an effect
    - effectivity, effectualness, effectuality
  2. Capacity to produce strong physiological or chemical effects
    "the toxin's effectiveness";
    - potency, strength

See also: effective, effectual, efficacious, impotent, ineffective, ineffectual, potent, stiff, strong, uneffective

Type of: power, powerfulness

Encyclopedia: Effectiveness