Definitions

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

  • transitive v. To remove magnetic properties from.
  • transitive v. To erase (a magnetic storage device).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To make something nonmagnetic by removing its magnetic properties.
  • v. To erase the contents of a magnetic storage device.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To deprive of magnetic properties; to render nonmagnetic. See magnetize.
  • transitive v. To free from mesmeric influence; to demesmerize.

from The Century Dictionary and Cyclopedia

  • To deprive of magnetic polarity.
  • To demesmerize; restore from a mesmerized state to normal consciousness.
  • Also spelled demagnetise.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. erase (a magnetic storage device)
  • v. make nonmagnetic; take away the magnetic properties (of)

Etymologies

From de- +‎ magnetize (Wiktionary)

Examples

  • In response to a question from Clinton, Gray argued that the best way to "demagnetize" the situation was to find third countries willing to provide "safe haven" for the boat people until Aristide could be restored.

    How Did We Get Here?

  • Still, the administration is trying to "demagnetize" America and persuade potential refugees to stay at home.

    How Do We Get To The Endgame?

  • They didn't even bother to ask for her receipt anymore when the librarians didn't demagnetize a book quite right and it set off the detectors on her way out, “go ahead, have a nice day,” they would say simply and with a casual wave of their hand.

    The Carnegie

  • The new systems cut down on one of the big annoyances of typical key cards that use magnetic strips: the cards sometimes demagnetize and stop working.

    Hotels Encourage Guests to Throw Away Their Keys

  • They demagnetize my credit cards so I cannot carry the key in my handbag.

    The Poet Prince

  • She twisted and pulled, trying to demagnetize them, but they held firm.

    Scott Westerfeld: Uglies Quartet

  • The Legend - Eelskin wallets demagnetize credit cards due to leftover charges from the electric eels used to make them.

    Science and the Urban Legend

  • I recently wrote a post called Science and the Urban Legend in which I debunked (among other things) the false belief that eel skin wallets demagnetize credit cards because of the residual electricity left over from the eels theyare made from.

    Just Shocking!

  • When iron on earth is diffused with more than 1% carbon it is difficult to magnetize and demagnetize.

    Neutron Star at Core of Cas A Has Carbon Atmosphere | Universe Today

  • Navy to demagnetize nuclear-missile submarines before they deploy, to make them harder to detect.

    China, Friend or Foe?

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