• synonyms


[in-vair-ee-uh nt]
See more synonyms for invariant on Thesaurus.com
  1. unvarying; invariable; constant.
  2. Mathematics. normal(def 5e).
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  1. Mathematics. a quantity or expression that is constant throughout a certain range of conditions.
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Origin of invariant

First recorded in 1850–55; in-3 + variant
Related formsin·var·i·ant·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for invariant

Historical Examples

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

    The Meaning of Truth

    William James

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

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

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

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

British Dictionary definitions for invariant


  1. maths an entity, quantity, etc, that is unaltered by a particular transformation of coordinatesa point in space, rather than its coordinates, is an invariant
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  1. maths (of a relationship or a property of a function, configuration, or equation) unaltered by a particular transformation of coordinates
  2. a rare word for invariable
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Derived Formsinvariance or 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

Word Origin and History for invariant


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

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Online Etymology Dictionary, © 2010 Douglas Harper