Changing or varying in two ways; having two variables or variable dimensions.
From Latin 'bi-' (two) + 'variant' (changing), from 'variare' (to vary). Used in mathematics and science to describe systems with two independent variables.
In chemistry, a bivariant system means you need to specify two pieces of information to know the state of the system—temperature AND pressure, for example. It's like needing to know both longitude AND latitude to find a location on Earth!
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