a word or a set of letters and numbers that you can use to get a discount (= a reduction in the usual price) when you buy something, given as a way of encouraging you to buy

Use the promo code "festival" to get a 15% discount on your tickets. 使用优惠码 "festival "可享受门票85折优惠。

Enter the promo code SMC09 on the "finish and pay" screen. 在 "完成并支付"界面输入优惠码SMC09。