[in-vair-ee-uh nt]
  1. 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 formsin·var·i·ant·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for invariantly


  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
  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
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 invariantly



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

Online Etymology Dictionary, © 2010 Douglas Harper