British spelling: to make cosmopolitan; to give something worldwide scope or appeal, or to encourage adoption of cosmopolitan attitudes and values.
From cosmopolitan + -ise (British verb-forming suffix, equivalent to American -ize). The verb form emerged as cosmopolitanism became a recognized social movement and philosophy.
When cities cosmopolitanise themselves—like Dubai deliberately attracting global talent and cultures—they're not just changing their populations, they're rewiring their entire social identity and economic systems to operate at a world scale.
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