invariant

[in-vair-ee-uhnt]

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.

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Invariant is always a great word to know.
So is mean. Does it mean:
an expression or a proposition, often algebraic, asserting the equality of two quantities
an average, especially the arithmetic average

Origin:
1850–55; in-3 + variant

in·var·i·ant·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
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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