The British spelling of denationalization; the process of removing state ownership or control from industries or assets, or stripping someone of national citizenship.
From de- (remove) + national + -isation (British suffix for forming nouns of action). The -isation ending is the British variant of -ization.
Denationalisation became huge in British politics during the 1980s when Margaret Thatcher sold off state industries like British Telecom and British Gas—it fundamentally transformed the British economy from public to private ownership!
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