Definition of reply coupon in English:

reply coupon

noun

  • A coupon used for prepaying the postage for the reply to a letter sent to another country.

    • ‘If those magazines included a reply coupon which you could return for the advertised value of your house then we would all know exactly where we were.’
    • ‘With the international reply coupon, you pre-pay the postage for sending standard letters from outside of Germany.’
    • ‘Attached to the end of the form you will find a reply coupon.’