# invariant

[in-vair-ee-uh nt] /ɪnˈvɛər i ənt/
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for invariant
Historical Examples
• Now the possibility of translation implies the existence of an invariant.

• We again obtain, therefore, the invariant system ice—salt—solution—vapour.

Alexander Findlay
• If triangles and genera are of our own production we can keep them invariant.

William James
• At this point there exists the invariant system solid nitrile, two liquid phases, vapour.

Alexander Findlay
• But relations between invariant objects will themselves be invariant.

William James
• Since the cryohydric point is a quadruple point in a two-component system, it represents an invariant system.

Alexander Findlay
• What now is the nature of this invariant it is easy to understand, and a word will suffice us.

• K is also an invariant point at which potassium iodide is in equilibrium with two liquid phases and vapour.

Alexander Findlay
• She is the invariant of each of her iconic Mantrams and her surroundings are the variables that enter and leave the screen.

Roger Phillips Graham
• At this point the system is invariant, and the pressure will therefore remain constant until all the iodine has disappeared.

Alexander Findlay
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
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for invariant

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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### Difficulty index for invariant

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### Word Value for invariant

0
15
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