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Discover LudwigThe word "effectualness" is correct and usable in written English.
You could use it to describe something that is capable of producing a desired or intended result. For example: "His expert planning and strategy gave the project an added effectualness."
Dictionary
effectualness
noun
The state or condition of being effectual.
Exact(1)
The origin of the symphony – Atilla's music for a movie on the topic – is audible in its effectualness and effectiveness.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com