n.
     - a complex whole; a set of things working together as a mechanism or interconnecting network. ▸the human or animal body as a whole. 
- an organized scheme or method. ▸orderliness; method. 
- 
(the system)
 the prevailing political or social order, especially when regarded as oppressive and intransigent.
- Geology  a major range of strata corresponding to a period in time.
- Music  a set of staves joined by a brace.
Phrase
  
    
      - get something out of one's system
 informal get rid of a preoccupation or anxiety.
 
  Derivative
  
  Etymology
  C17: from Fr. système or late L. systema, from Gk sustēma, from sun- ‘with’ + histanai ‘set up’.