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The word 'invariable' is correct and usable in written English
It can be used as an adjective to describe something that does not change or vary, or as a noun to refer to a constant or unchanging element. Example: "The laws of physics are invariable and apply uniformly throughout the universe." OR "The invariable presence of his best friend gave him comfort during his difficult times."
Dictionary
Invariable
noun
Something that does not vary; a constant.
synonyms
Exact(59)
Occasionally we read stories of undercover officers, or police intimidating campaigners in their homes or sending threatening letters; but rarely do we talk about the psychological toll this takes – that a feeling of constantly being watched is an invariable factor in the lives of people who take part in protest.
The bankers caused this mess but are doing fine while ordinary folk suffer, is the invariable charge.
Instead, he thought brands needed to express "longevity and invariable qualitative values" that are already embedded in their histories and products.
Mass, then, is not thought an invariable property of matter.
The favourites hang back, hoping not to be caught in the invariable spills caused by 189 riders jostling for space on narrow roads.
The ruling principle of his turbulent years as the leader of Poland's Catholics was to ask: "What would Primate Wyszynski have done?" The invariable answer: "Defend the church .God willed it, too, that another giant loomed over him.
And when a president is elected, there is an invariable tendency however short-lived to rally round the victor.
Erskine May, the accepted authority on parliamentary procedure, says that it is "the usual but not invariable practice" for prorogation (the end of Parliament's sittings) and dissolution to occur on the same day.
The metre and the second are already defined in terms of invariable natural phenomena, so that any laboratory that needs to can construct its own.
Nor will it intervene in militia fights, the invariable prelude to civilian massacres.
Adverbs, prepositions, conjunctions, and interjections are invariable.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com