the quality or state of being disabled; the condition of lacking the ability or power to do something.
From 'disable' plus the abstract noun suffix '-ness,' which turns adjectives and some verbs into nouns expressing a state or quality. This formation mirrors the structure of 'dirtiness' discussed above.
Words like 'disableness' are grammatically perfect but sound quite archaic today—modern English prefers 'disability' instead, showing how word preferences change over time as some forms age out and newer ones take over.
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