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Longman Dictionary of Contemporary English
invariable
adjective
EXAMPLES FROM OTHER ENTRIES
▪ Mrs. Van der Luyden's invariable reply was, "I'll have to discuss it with my husband."
▪ the invariable rules of mathematics
The Collaborative International Dictionary
Invariable

Invariable \In*va"ri*a*ble\, a. [Pref. in- not + variable: cf. F. invariable.] Not given to variation or change; unalterable; unchangeable; always uniform.

Physical laws which are invariable.
--I. Taylor. -- In*va"ri*a*ble*ness, n. -- In*va"ri*a*bly, adv.

Invariable

Invariable \In*va"ri*a*ble\, n. (Math.) An invariable quantity; a constant.

Douglas Harper's Etymology Dictionary
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.

Wiktionary
invariable

a. 1 Not variable; unalterable; uniform; always having the same value. 2 (lb en math) constant. 3 (lb en by extension grammar of a word, or a grammatical class) That cannot undergo inflection, conjugation or declension. n. Something that does not vary; a constant.

WordNet
invariable

adj. not liable to or capable of change; "an invariable temperature"; "an invariable rule"; "his invariable courtesy" [ant: variable]

Usage examples of "invariable".

If the skein of historical causality had been different - if the brilliant guesses of the atomists on the nature of matter, the plurality of worlds, the vastness of space and time had been treasured and built upon, if the innovative technology of Archimedes had been taught and emulated, if the notion of invariable laws of Nature that humans must seek out and understand had been widely propagated - I wonder what kind of world we would live in now.

Dutch traders were scrupulously honest in their dealings and purchased by weight, establishing it as an invariable table of avoirdupois, that the hand of a Dutchman weighed one pound, and his foot two pounds.

For me, no venerable spinster hoarded in the Trongate, permitting herself few luxuries during a long-protracted life, save a lass and a lanthorn, a parrot, and the invariable baudrons of antiquity.

We must therefore reflect whether it may be taken as an invariable rule that Quality is never a differentia of Quality, any more than Substance is a differentia of Substance, or Quantity of Quantity.

They were the heads of families with many members, an important iconographic consideration, for these families had emblems and a distinguishing colour whose use in a given context had to be invariable.

Yet the advocates of unrestricted vivisection have never been willing to consider this position, and, in controversy, invariable fall back upon arguments applicable only to the views of those who would abolish vivisection altogether.

He travelled by jeep through an invariable terrain of architectonic vegetation where no wind lifted the fronds of palms as ponderous as if they had been sculpted out of viridian gravity at the beginning of time and then abandoned, whose trunks were so heavy they did not seem to rise into the air but, instead, drew the oppressive sky down upon the forest like a coverlid of burnished metal.

Valley, most of us made it our practice to rise with the dawn, and, immediately after a bath in the ice-cold Merced, take a breakfast which might sometimes fail in the game-department, but was an invariable success, considered as slapjacks and coffee.

This transvaluation of values is an invariable accompaniment of Culture-Distortion, and represents a super-personal life-necessity of the Culture-distorting element.

Through the other three windows the sun would be throwing three squares of light, crossed with the shadows of the window-frames, and where one of these patches marked the unstained floor of the room there would be lying, in accordance with invariable custom, Milka, with her ears pricked as she watched the flies promenading the lighted space.

From either the blind or the intelligent operation of this infinite Time, which bears but too near an affinity with the chaos of the Greeks, the two secondary but active principles of the universe, were from all eternity produced, Ormusd and Ahriman, each of them possessed of the powers of creation, but each disposed, by his invariable nature, to exercise them with different designs.

The general fertility of varieties does not seem to me sufficient to overthrow the view which I have taken with respect to the very general, but not invariable, sterility of first crosses and of hybrids, namely, that it is not a special endowment, but is incidental on slowly acquired modifications, more especially in the reproductive systems of the forms which are crossed.

Jack fairly shovelling it down like a boy, then half a small tunny, caught by trolling over the side, and then their almost invariable toasted cheese, a Minorcan fromatge duro, not unlike Cheddar, that toasted remarkably well.

Roman world forty-two years, with the same invariable spirit of wisdom and virtue.

But it was quite clear what the Germans intended because they were going through that curious performance of patting and stroking their assegais and speaking to them as if they were human beings, which is their invariable custom before shedding blood with those terrible weapons.