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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
It may mark the recurrence of a period of increased sun spots, with the invariable accompaniment of increased solar radiation.
What mattered was their inevitable and invariable violation of all those agreements.
Entropy is the invariable feature of every investigation.
Extravagant patterning camouflages the invariable chill.
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