from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A measure of the ability of a material to resist the formation of an electric field within it.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A property of a dielectric medium that determines the forces that electric charges placed in the medium exert on each other.

from The Century Dictionary and Cyclopedia

  • n. In elec., degree of permittance; the ratio of permittance of a dielectric to that of air.
  • n. In electricity, degree of permittance; the ratio of permittance of a dielectric to that of air.


Sorry, no etymologies found.


  • This ability is represented by constants or fixed quantities that are called the permittivity (for electricity) and permeability (for magnetism).

    Michael Prescott's Blog

  • Ford Fusion hybrid hypermiles, goes 1,445 miles on a single tank Shai Agassi talks about Better Place, $20,000 EV, batteries extra EEStor "permittivity" follow-up, by someone who knows (Daryl Siry)


  • LA 2009: GM announces 100-vehicle Volt test fleet for utilities in California EEStor "permittivity" follow-up, by someone who knows (Daryl Siry)

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  • The trick is to create a material in which the permittivity and permeability are complementary to the values in a nearby region of space containing the mouse we want to hide.

    Illusion Cloaks: Create Illusion To Make One Object Look Like Another | Impact Lab

  • So according to Anaconda, then Gauss's Laws for electrostatics and magnostatics must be; rho/ epsilon0 = 0, where rho is the charge density and epsilon0 is the permittivity.

    Could a Black Hole Fit in Your Computer or In Your Pocket? | Universe Today

  • I think that register Fermi is affected strongly by Universe expansion, changes in density of energy of vacuum; and probably changes in permittivity and permeability.

    Einstein Still Rules, Says Fermi Telescope Team | Universe Today

  • The elements of the meta-material are designed to modify both the electric and the magnetic fields of the incoming waves so that the overall electric permittivity e and magnetic permeability m are negative, and therefore are unlike the values of these constants in any known natural material.

    Analog Science Fiction and Fact

  • And, if, somehow, the measuring and combining of permittivity and permeability are involved in the deriving of values from the Michealson-MOrley Experiment, it is likely that light really does travel at different speeds depending on the observer!

    Breaking News: CBS News

  • Since, supposedly, the permittivity and permeability are constant, that means, under all circumstances, the speed of light measured using them would always produce the same value no matter what true value light had!

    Breaking News: CBS News

  • Maxwell calculated the speed of light as the inverse of the square root of the product of the electrostatic permittivity of free space and the magnetic permeability.

    Breaking News: CBS News


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