[ in-vair-ee-uh nt ]
/ ɪnˈvɛər i ənt /


unvarying; invariable; constant.
Mathematics. normal(def 5e).


Mathematics. a quantity or expression that is constant throughout a certain range of conditions.

Origin of invariant

First recorded in 1850–55; in-3 + variant

Related forms

in·var·i·ant·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for invariant

British Dictionary definitions for invariant


/ (ɪnˈvɛərɪənt) /


maths an entity, quantity, etc, that is unaltered by a particular transformation of coordinatesa point in space, rather than its coordinates, is an invariant


maths (of a relationship or a property of a function, configuration, or equation) unaltered by a particular transformation of coordinates
a rare word for invariable

Derived Forms

invariance 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