Definition of "invariability" [in•va•ri•a•bil•i•ty]

• The quality of being invariable; invariableness; constancy; uniformity. (noun)

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• "In his early years, Linnaeus believed that the species was not only real, but unchangeable — as he wrote, Unitas in omni specie ordinem ducit (The invariability of species is the condition for order [in nature])."
• "So there is, as we might put it, a core of invariability surrounded by a variable periphery."
• "The theory of the French writer is that Ibsen's constant aim is to reconcile and to conciliate the two biological hypotheses which have divided opinion in the nineteenth century, and which are known respectively by the names of Cuvier and Lamarck; namely, that of the invariability of species and that of the mutability of organic forms."