in·var·i·ant

[in-vair-ee-uhnt]
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

in·var·i·ant·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
invariant (ɪnˈvɛərɪənt) [Click for IPA pronunciation guide]
 
n
1.  maths an entity, quantity, etc, that is unaltered by a particular transformation of coordinates: a point in space, rather than its coordinates, is an invariant
 
adj
2.  maths (of a relationship or a property of a function, configuration, or equation) unaltered by a particular transformation of coordinates
3.  a rare word for invariable
 
in'variance
 
n
 
in'variancy
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Invariant is always a great word to know.
So is coefficient. Does it mean:
the property of magnitude involving comparability with other magnitudes, size, volume, area, or length
a number or quantity placed before and multiplying another quantity, such as 3 in the expression 3x
FOLDOC
Computing Dictionary

invariant definition

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, © Denis Howe 2010 http://foldoc.org
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Example sentences
Even though the words may differ, the mental constructions tend to be rather
  invariant across cultures.
The magnetic field is time invariant and uniform in strength over the
  containment region.
We find universal distributions with scale invariant behaviour.
Finally, some of the genes which explain differences between populations are
  invariant within a population.
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