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invariable

[in-vair-ee-uh-buh l] /ɪnˈvɛər i ə bəl/
adjective
1.
not variable; not changing or capable of being changed; static or constant.
noun
2.
something that is invariable; a constant.
Origin
late Middle English
1400-1450
1400-50; late Middle English; see in-3, variable
Related forms
invariability, invariableness, noun
invariably, adverb
Synonyms
1. unalterable, unchanging, changeless, invariant, unvarying, immutable.
Antonyms
1. changing.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in variable

invariable

/ɪnˈvɛərɪəbəl/
adjective
1.
not subject to alteration; unchanging
noun
2.
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 in variable

invariable

adj.

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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