[pur-mi-tiv-i-tee] 
| Electricity. the ratio of the flux density produced by an electric field in a given dielectric to the flux density produced by that field in a vacuum. |
| permittivity (pûr'mĭ-tĭv'ĭ-tē) Pronunciation Key
A measure of the ability of a material to resist the formation of an electric field within it, equal to the ratio between the electric flux density and the electric field strength generated by an electric charge in the material. |
mɪˈtɪv