system (n.)

1610s, "the whole creation, the universe," from Late Latin systema "an arrangement, system," from Greek systema "organized whole, a whole compounded of parts," from stem of synistanai "to place together, organize, form in order," from syn- "together" (see syn-) + root of histanai "cause to stand," from PIE root *sta- "to stand, make or be firm."

Meaning "set of correlated principles, facts, ideas, etc." first recorded 1630s. Meaning "animal body as an organized whole, sum of the vital processes in an organism" is recorded from 1680s; hence figurative phrase to get (something) out of one's system (1900). Computer sense of "group of related programs" is recorded from 1963. All systems go (1962) is from U.S. space program. The system "prevailing social order" is from 1806.

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Definitions of system from WordNet

system (n.)
instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity;
the system consists of a motor and a small computer
he bought a new stereo system
system (n.)
a group of independent but interrelated elements comprising a unified whole;
a vast system of production and distribution and consumption keep the country going
Synonyms: scheme
system (n.)
(physical chemistry) a sample of matter in which substances in different phases are in equilibrium;
a system generating hydrogen peroxide
in a static system oil cannot be replaced by water on a surface
system (n.)
a complex of methods or rules governing behavior;
that language has a complex system for indicating gender
they have to operate under a system they oppose
Synonyms: system of rules
system (n.)
an organized structure for arranging or classifying;
he tried to understand their system of classification
system (n.)
a group of physiologically or anatomically related organs or parts;
the body has a system of organs for digestion
system (n.)
a procedure or process for obtaining an objective;
they had to devise a system that did not depend on cooperation
system (n.)
the living body considered as made up of interdependent components forming a unified whole;
exercise helped him get the alcohol out of his system
system (n.)
an ordered manner; orderliness by virtue of being methodical and well organized;
we can't do it unless we establish some system around here