invariable

[in-vair-ee-uh-buhl]
adjective
1.
not variable; not changing or capable of being changed; static or constant.
noun
2.
something that is invariable; a constant.

Origin:
1400–50; late Middle English; see in-3, variable

invariability, invariableness, noun
invariably, adverb


1. unalterable, unchanging, changeless, invariant, unvarying, immutable.


1. changing.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
invariable (ɪnˈvɛərɪəbəl)
 
adj
1.  not subject to alteration; unchanging
 
n
2.  a mathematical quantity having an unchanging value; a constant
 
invaria'bility
 
n
 
in'variableness
 
n

invariably (ɪnˈvɛərɪəblɪ)
 
adv
always; without exception

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

invariable
1607, from in- "not" + variable.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Sailing, he'd invite my friends and me to stay up half the night playing poker
  in an invariably smoke-filled cabin.
But, inevitably, you will walk and look and invariably twist your ankle.
The other two forms are almost invariably fatal without antibiotics.
Invariably, sealers consider it to be too low and conservationists too high.
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