The quality or state of being effectual; the capacity to produce real, substantive results.
From 'effectual' plus the suffix '-ity' (quality). Traces back through medieval Latin philosophical terminology emphasizing actual causation.
Medieval philosophers loved this word because it captured a subtle distinction—something with 'effectuality' doesn't just claim to work, it has proven causal power in the real world. It's metaphysics made into vocabulary.
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