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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
1400-50; late Middle English; see 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. 2015.
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Examples from the Web for invariable
Contemporary Examples
Historical Examples
  • The journey is also rendered disagreeable by the dust which is the invariable concomitant of Argentine railway travelling.

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

  • In trains of this description, the velocity ratio is invariable; which for the above-mentioned objects it should be.

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

    Brighter Britain! (Volume 1 of 2) William Delisle Hay
  • "Really, I've hardly had a chance to notice yet," was Frank's invariable answer.

    Angel Island Inez Haynes Gillmore
  • In the invariable "Thank you, mem's" of the Paliser personnel there had been more.

    The Paliser case Edgar Saltus
  • Attention has been called to hypertension as an early, and some think an invariable, sign of chronic nephritis.

    Arteriosclerosis and Hypertension: Louis Marshall Warfield
  • It is an invariable rule with me that the turnips are filled by hand in wet weather.

    Cattle and Cattle-breeders William M'Combie
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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