The quality or state of being elemental; the essential, fundamental, or basic nature of something.
From 'elemental' + '-ity' (a suffix forming abstract nouns from adjectives). This noun captures the abstract notion of what makes something fundamentally essential.
The 'elementality' of water is that it's simultaneously simple (H₂O) yet impossibly complex in its behavior—this paradox is why water remains one of science's greatest mysteries despite being the most studied substance.
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