The quality of being extremely light, airy, delicate, or heavenly; something that seems to belong to heaven rather than earth.
From ethereal (from Latin aether) plus -ity (suffix forming abstract nouns). The suffix -ity turns the adjective into a noun describing the state or quality.
In chemistry, 'ether' is a real substance with an incredibly low boiling point that evaporates almost instantly — so the word 'ethereal' literally comes from trying to describe something so light and insubstantial it's barely there.
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