The phrase "major bureaus" refers to the important offices or departments of an organization or government that have significant roles and responsibilities. Full definition
You're entitled by law to view your credit scores as calculated by each of the three major bureaus once per year. (pointsaway.com)
There are some minor differences in the way the three major bureaus look at your personal credit information. (ondeck.com)
Each bureau gathers information used in their systems independently and none of the three major bureaus share information with the others - meaning they could potentially be working with different information. (selflender.com)