A foreign currency held by a central bank or monetary authority for the purposes of exchange intervention and the settlement of intergovernmental claims. Bloomberg Financial Dictionary
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Internationally accepted currency, used by central banks to meet their financial commitments.
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reserve currency UK US noun [C or U] FINANCE
► a particular currency that is held by many countries who use it to make payments to other countries: »
The dollar is effectively the reserve currency of the world.
Financial and business terms. 2012.