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Cambridge Definition
money that is charged, esp. by a bank, when you borrowmoney, or money that is paid to you for the use of yourmoney
Cambridge Link
INTEREST – Cambridge English Dictionary
Wikipedia Definition
In finance and economics, interest is payment from a debtor or deposit-taking financial institution to a lender or depositor of an amount above repayment of the principal sum (that is, the amount borrowed), at a particular rate.[1]