an assemblage or combination of things or parts forming a complex or unitary whole

a mountain system; a railroad system.

any assemblage or set of correlated members

a system of currency; a system of shorthand characters.

an ordered and comprehensive assemblage of facts, principles, doctrines, or the like in a particular field of knowledge or thought

a system of philosophy.

a coordinated body of methods or a scheme or plan of procedure; organizational scheme

a system of government.

any formulated, regular, or special method or plan of procedure

a system of marking, numbering, or measuring; a winning system at bridge.

due method or orderly manner of arrangement or procedure

There is no system in his work.

the world or universe.

Astronomy .

a number of heavenly bodies associated and acting together according to certain natural laws

the solar system.

a hypothesis or theory of the disposition and arrangements of the heavenly bodies by which their phenomena, motions, changes, etc., are explained

the Ptolemaic system; the Copernican system.

Biology .

an assemblage of organs or related tissues concerned with the same function

the nervous system; the digestive system.

the entire human or animal body considered as a functioning unit

an ingredient toxic to the system.

one's psychological makeup, esp. with reference to desires or preoccupations

to get something out of one's system.

a method or scheme of classification

the Linnean system of plants.

( sometimes initial capital letter ) the prevailing structure or organization of society, business, or politics or of society in general; establishment (usually prec. by the )

to work within the system instead of trying to change it.

Geology . a major division of rocks comprising sedimentary deposits and igneous masses formed during a single geologic period.

Physical Chemistry . a combination of two or more phases, as a binary system, each of which consists of one or more substances, that is attaining or is in equilibrium.

Computers . a working combination of hardware, software, and data communications devices.

Checkers . either of the two groups of 16 playing squares on four alternate columns.