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[in-vair-ee-uh-buh l] /ɪnˈvɛər i ə bəl/
not variable; not changing or capable of being changed; static or constant.
something that is invariable; a constant.
Origin of invariable
late Middle English
late Middle English word dating back to 1400-50; See origin at in-3, variable
Related forms
invariability, invariableness, noun
invariably, adverb
1. unalterable, unchanging, changeless, invariant, unvarying, immutable.
1. changing. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for invariable
Contemporary Examples
Historical Examples
  • Accuracy is also of much importance, and an invariable mark of good training in a man.

    Self-Help 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.

    Brighter Britain! (Volume 1 of 2) William Delisle Hay
  • Far purer, he replied, is the being of that which is concerned with the invariable.

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

    The Republic Plato
  • "Goin' right along down on my own account, ma'am," was his invariable excuse.

    Shavings Joseph C. Lincoln
  • The invariable mark of wisdom is to see the miraculous in the common.

    Nature Ralph Waldo Emerson
  • In the invariable "Thank you, mem's" of the Paliser personnel there had been more.

    The Paliser case Edgar Saltus
British Dictionary definitions for invariable


not subject to alteration; unchanging
a mathematical quantity having an unchanging value; a constant
Derived Forms
invariability, 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
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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
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