'angelicness' originates from English, specifically from the adjective 'angelic' with the suffix '-ness' added to form a noun, where 'angelic' means 'like an angel.'

'angelic' comes from Old French 'angelique', from Late Latin 'angelicus', from Greek 'angelikos', and the suffix '-ness' is used in English to form nouns indicating a state or quality. 'Angelicness' thus formed in modern English as the noun form of 'angelic.'

Initially, it meant 'the state of being like an angel,' and this meaning has remained unchanged in modern usage.