dollarisation

/D AO1 L ER0 AH0 Z EY1 SH AH0 N/
noun
  1. 1

    The process of a country, officially, or its residents, unofficially, adopting the US dollar or other foreign currency in parallel to or instead of the domestic currency.

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Source: https://en.wiktionary.org/wiki/dollarisation, https://en.wiktionary.org/wiki/dollarization