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invariant

[in-vair-ee-uh nt] /ɪnˈvɛər i ənt/
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 of invariant
1850-1855
1850-55; in-3 + variant
Related forms
invariantly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for invariant

invariant

/ɪnˈvɛərɪənt/
noun
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
adjective
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
Derived Forms
invariance, invariancy, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for invariant
adj.

1851, from in- (1) "not" + variant.

Online Etymology Dictionary, © 2010 Douglas Harper
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invariant in Technology

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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