By a factor of one hundred times; to a hundredfold degree.
From 'centuple' (meaning hundredfold, from Latin 'centum' meaning hundred + 'plus' meaning fold) + '-y' creating an adverbial form, or directly related to the French 'centuple.'
This word is rarely used today, but when you encounter it in older texts, it captures an almost ancient sense of awe at multiplying something by a hundred—imagine how mind-blowing that would have seemed before calculators.
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