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.
MANAGEMENT LEVELS. Managers are organizational members who are responsible for the work performance of other organizational members. Managers have formal authority to use organizational resources and to make decisions. In organizations, there are typically three levels of management: top-level, middle-level, and first-level. These three main levels of managers form a hierarchy, in which they are ranked in order of importance.