invariant

[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

invariantly, adverb
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World English Dictionary
invariant (ɪnˈvɛərɪənt)
 
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
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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
Several exhibited different biometric devices that would scan fingerprints and
  other invariant parts of a body.
They are universally invariant, conditions may change but the laws never vary.
The magnetic field is time invariant and uniform in strength over the
  containment region.
The speed of light is invariant for all inertial frames of reference.
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