From Longman Business DictionaryZ-scoreˈZ-score noun [countable] FINANCESTATISTICS a figure that shows how likely it is that a business will fail. The Z-score is calculated using information about the relative levels of a business’s assets, sales, profits etc and is correct about 90% of the time in calculating if a business will go bankrupt within one yearAuditors at one point gave the company a Z-score of 2.27.