magneto Syllabification: (mag·ne·to)Pronunciation: /magˈnētō/Definition of magneto noun (plural magnetos) a small electric generator containing a permanent magnet and used to provide high-voltage pulses, especially (formerly) in the ignition systems of internal combustion engines. Origin: late 19th century: abbreviation of magneto-electricmagneto in other Oxford dictionaries Definition of magneto in the British & World English dictionary