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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 of closed system
1895-1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for closed system

a complete and seemingly unchangeable set of doctrines, ideas, or things; a self-contained system that is unaffected by outside influences's 21st Century Lexicon
Copyright © 2003-2014, LLC
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closed system in Science
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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