The quality or property of being accusative; the characteristic of functioning as or relating to the accusative case.
From accusative plus the suffix -ness. This abstract noun allows grammarians to discuss the essential properties of the accusative case as a linguistic category.
This is a super technical word that linguists might use, but it's a great example of how English can stack suffixes—accusative + -ness = a noun describing the abstract property of being accusative!
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