An attrition score is a measure of the gradual reduction or weakening of a group or organization over time due to natural causes, such as retirement, resignation, or death, or external factors, such as economic downturns or competition. It is often used in business to assess the rate at which employees leave a company, and can also be applied to other contexts, such as military units or sports teams. A high attrition score may indicate underlying issues within the group, while a low score may suggest stability and success.