The quality of being effectual; the capacity to achieve intended results in a substantive, real way.
From 'effectual' plus the suffix '-ness' (quality or state). Creates a noun form emphasizing the abstract quality of effectiveness.
English gives us three ways to express this concept: 'effectiveness' (common), 'effectuality' (philosophical), and 'effectualness' (emphasizing inherent quality). Writers choose based on tone—effectiveness is modern, effectualness feels slightly archaic and authoritative.
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