noun: a natural tendency to behave in a particular way
noun: a disposition to behave in a certain way ("The propensity of disease to spread")
noun: a natural inclination
noun: an inclination to do something

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Schauberger
This is especially true of water. It is therefore important to study the nature of water, its inner propensities and its capacity for onward transmission so that general and individual progress can be fostered through the possibility of its ennoblement. [The Energy Evolution - Harnessing Free Energy from Nature, The Ennoblement of Water]

See Also
eigenfrequency
state