closed system

noun Thermodynamics.
a region that is isolated from its surroundings by a boundary that admits no transfer of matter or energy across it.
Compare open system.


Origin:
1895–1900

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  closed system
Part of Speech:  n
Definition:  a complete and seemingly unchangeable set of doctrines, ideas, or things; a self-contained system that is unaffected by outside influences
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American Heritage
Science Dictionary
closed system  
A physical system that does not interact with other systems. A closed system obeys the conservation laws in its physical description. Also called isolated system. Compare open system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It also retains the total factor cost, which is equal to the total factor
  income in a closed system.
Cable will still be a closed system and neither company will have access to
  track that content.
And if it were developed this way, it would have to be a tightly-controlled
  closed system.
No human organ system is a closed system, including the central nervous system.
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