not variable; not changing or capable of being changed; static or constant.


something that is invariable; a constant.

Origin of invariable

late Middle English word dating back to 1400–50; see origin at in-3, variable
Related formsin·var·i·a·bil·i·ty, in·var·i·a·ble·ness, nounin·var·i·a·bly, adverb

Synonyms for invariable

Antonyms for invariable

1. changing. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for invariable

Contemporary Examples of invariable

Historical Examples of invariable

  • Accuracy is also of much importance, and an invariable mark of good training in a man.


    Samuel Smiles

  • "I've no need of anything," was Florent's invariable answer.

  • Tea is the invariable beverage at every meal, and almost the only one, too.

  • Far purer, he replied, is the being of that which is concerned with the invariable.

  • And does the essence of the invariable partake of knowledge in the same degree as of essence?

British Dictionary definitions for invariable



not subject to alteration; unchanging


a mathematical quantity having an unchanging value; a constant
Derived Formsinvariability or invariableness, 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 invariable

early 15c., from Old French invariable (14c.) and directly from Medieval Latin invariabilis, from in- "not, opposite of" (see in- (1)) + variabilis (see variable). Related: Invariably.

Online Etymology Dictionary, © 2010 Douglas Harper