The quality or state of being healthy and free from disease or weakness.
From 'healthy' (Old English 'hælth') combined with '-ness', a suffix that converts adjectives into abstract nouns representing their quality or condition.
The abstract noun 'healthiness' lets us talk about health as a measurable quality—like how we can say 'his healthiness improved' rather than just 'he is healthier,' giving us flexibility in describing gradual changes.
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