1. to remove national character, status, or control from something; to make no longer national in scope or ownership
Usage: chiefly British spelling; American English typically uses 'denationalize'; often used in political and economic contexts
2. to deprive a person of national citizenship or national identity
Usage: formal or legal usage

Examples

• The government decided to denationalise the railway system and sell it to private companies.
• Several countries have chosen to denationalise their state-owned industries.
• The policy aimed to denationalise healthcare by reducing government control.
• After the political crisis, the regime threatened to denationalise certain citizens.
• Denationalising the postal service proved controversial among voters.