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Noun: effectivity  ,e,fek'ti-vu-tee or i,fek'ti-vu-tee
  1. Power to be effective; the quality of being able to bring about an effect
    - effectiveness, effectualness, effectuality

See also: effective, effectual, efficacious, ineffective, ineffectual, uneffective

Type of: power, powerfulness

Antonym: ineffectualness