A group of interacting, interrelated, or interdependent elements forming a complex whole. A functionally related group of elements, especially: The human body regarded as a functional physiological unit. An organism as a whole, especially with regard to its vital processes or functions. A group of physiologically or anatomically complementary organs or parts: the nervous system; the skeletal system. A group of interacting mechanical or electrical components. A network of structures and channels, as for communication, travel, or distribution. A network of related computer software, hardware, and data transmission devices. An organized set of interrelated ideas or principles. A social, economic, or political organizational form. A naturally occurring group of objects or phenomena: the solar system. A set of objects or phenomena grouped together for classification or analysis. A condition of harmonious, orderly interaction. An organized and coordinated method; a procedure. See Synonyms at method. The prevailing social order; the establishment. Used with the: You can't beat the system.