The quality or state of being airy; spaciousness, breeziness, or lack of substance.
From 'airy' with noun suffix '-ness' (from Old English '-nes'). This standard suffix converts adjectives into abstract nouns describing their qualities.
Architects measure 'airiness' partly by air-exchange rates, but also by how much of your visual field is unobstructed—that's why sparse furniture makes rooms feel bigger than their actual square footage.
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