The quality or state of lasting forever; the abstract concept of eternal existence or permanence.
From 'forevern' (an obsolete form) or 'forever' + '-ness' (forming abstract nouns indicating quality). This highly archaic term appears in 16th-century philosophical and theological texts exploring eternity.
Philosophers searching for words to describe infinity created 'foreverness'—it's essentially the noun form of forever, a word trying to trap the concept of endless time in grammar, though English ultimately preferred just saying 'forever.'
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