DEMAGNETIZE Meaning of DEMAGNETIZE in English de ‧ mag ‧ ne ‧ tize BrE AmE ( also demagnetise British English ) /ˌdiːˈmæɡnətaɪz/ verb [transitive] to take away the ↑ magnetic qualities of something Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012