Definitions for "Legal tender"
Coins that have been authorized by Congress. This includes circulating coins and all commemorative coins legislated by Congress.
a coin declared by a government to be acceptable in the payment of all debts
The form of currency in which someone has the legal right to pay a debt , and which a creditor must accept. In the UK, banknotes have unlimited legal tender, but, for example, 50p coins have legal tender only up to £10.
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