third estate n the third order or class in a country or society divided into estates, esp. for representation in a parliament; the commons, townsmen, or middle class English Collins Dictionary - English Definition & Thesaurus
DEFINITION of 'C-Suite'. A widely-used slang term used to collectively refer to a corporation's most important senior executives. C-Suite gets its name because top senior executives' titles tend to start with the letter C, for chief, as in chief executive officer, chief operating officer and chief information officer.
C Corporations. Many refer to C corporations simply as corporations. A C corporation pays taxes under Chapter C of the IRS tax code, which is where the name comes from. That means the corporation itself is a legal entity that is liable for its own debts and pays its own taxes.