› an act of lending something, esp. a sum of money that that has to be paid back with interest (= an additional amount of money that is a percentage of the amount borrowed), or an amount of money that has been lent: [U] Thanks for the loan of your bike. [C] My brother repaid his student loan within five years. The painting is on loan to the Metropolitan Museum of Art (= has been lent to it, esp. for more than a short period of time).