The present participle or gerund form of demagnetize; the process of removing magnetic charge or properties from something.
From demagnetize + -ing (continuous aspect marker). The -ing suffix comes from Old English and indicates an ongoing action. This form became common in technical writing once magnetism became a major industrial concern.
Demagnetizing is so important in manufacturing that whole industries depend on it—when you strip a wire of its magnetic coating or reset a tape head, you're performing controlled demagnetization. Even your brain uses natural demagnetizing principles when iron in your blood moves through changing magnetic fields!
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