The quality or state of being celestial; the nature of belonging to the heavens or being heavenly in character.
From 'celestial' (from Latin 'caelestis' meaning heavenly, derived from 'caelum' meaning sky or heaven) plus the suffix '-ity' (meaning state or quality). The word evolved in English to express abstract heavenly qualities.
Celestiality is the word theologians and poets reached for when they wanted to describe something beyond just 'being in the sky'—it's about the spiritual quality of belonging to the realm of heaven itself.
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