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invariant

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in⋅var⋅i⋅ant

  [in-vair-ee-uhnt]
Use invariant in a Sentence
–adjective
1. unvarying; invariable; constant.
2. Mathematics. normal (def. 5e).
–noun
3. Mathematics. a quantity or expression that is constant throughout a certain range of conditions.
Origin:
1850–55; in- 3 + variant

Related forms:
in⋅var⋅i⋅ant⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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in·var·i·ant   (ĭn-vâr'ē-ənt)   
adj.  

  1. Not varying; constant.

  2. Mathematics Unaffected by a designated operation, as a transformation of coordinates.

n.  An invariant quantity, function, configuration, or system.
in·var'i·ance n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

invariant programming
A rule, such as the ordering of an ordered list or heap, that applies throughout the life of a data structure or procedure. Each change to the data structure must maintain the correctness of the invariant.
(1996-03-12)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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