The quality or state of being acetose; sourness or acidity like vinegar.
From 'acetose' + Latin suffix '-ity' (quality of). This abstract noun construction follows the standard English pattern of converting adjectives to nouns describing their inherent qualities.
Before modern chemistry had precise pH measurements, people described degrees of sourness as 'acetosity'—it's a beautiful example of how older scientific terms used sensory experience rather than numbers to understand the world.
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