IPA: /ˌdiːˌmæɡnɪˈzeɪʃən/
KK: /dɛmˌæɡnətaɪˈzeɪʃən/
The process of removing the magnetic field from an object.
The demagnetization of the metal was necessary to ensure it would not interfere with the electronic devices.
Demagnetization → It is formed from "de-" (meaning removal or reversal) and "magnet" (from Latin "magnes", meaning magnet or lodestone) and "-ization" (meaning the process of making or becoming). The word describes the process of removing or reversing the magnetic properties of an object.
Think of 'removing' ('de-') the 'magnetic' properties of something — that's what demagnetization means.