permittivity
noun
per·mit·tiv·i·ty
ˌpər-ˌmi-ˈti-və-tē
-mə-
: the ability of a material to store electrical potential energy under the influence of an electric field measured by the ratio of the capacitance of a capacitor with the material as dielectric to its capacitance with vacuum as dielectric
called also dielectric constant
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Merriam-Webster unabridged
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