appoint

an amount of small change; money which completes a payment, balances an account; complementary support

“Pour faire mille douze francs, il faut un billet de mille francs et un appoint de douze francs.” — To make one thousand and twelve francs, you need a thousand-franc note and twelve francs in change.

Deverbal of appointer. from Old French apoint (“favorable occasion; resolution, agreement”), from Old French apointier (“to work out, solve”), from Late Latin appunctare (“to bring back to the point, restore, to fix the point in a controversy, or the points in an agreement”); Latin ad + punctum (“a point”).