The quality or state of having two distinct forms, shapes, or natures; the characteristic of being biform.
From Latin 'biformis' + '-ity' (suffix creating abstract nouns). The word emerged to describe the philosophical and physical concept of existing in two different forms.
The biformity of water—existing as liquid, ice, and steam—was mind-blowing to ancient scientists and gave rise to theories about how matter itself could transform between states.
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