Increased or multiplied by eighty times; consisting of eighty parts, layers, or components.
From 'eighty' (eight times ten) plus 'fold' (meaning to multiply). Follows the same pattern as other multiplication adjectives in English.
While 'eightyfold' is grammatically correct, it's almost never used because we rarely need to multiply anything by exactly eighty—unlike 'tenfold' or 'hundredfold,' which appear regularly!
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