permittivity

noun
per·mit·tiv·i·ty | \ˌpər-ˌmi-ˈti-və-tē, -mə-\

Definition of permittivity 

: 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

First Known Use of permittivity

1887, in the meaning defined above

History and Etymology for permittivity

permit entry 1 + -ivity (as in selectivity)

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The first known use of permittivity was in 1887

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