I.  ˌduty-ˈfree1  adjective duty-free goods can be brought into a country without paying tax on them: 
 duty-free cigarettes
 duty-free cigarettes the duty-free shop—duty-free adverb
 the duty-free shop—duty-free adverb [TahlilGaran] Dictionary of Contemporary English ▲
 II.  duty-free2  noun [uncountable and countable] alcohol, cigarettes etc that you can bring into a country without having to pay tax on them 
 [TahlilGaran] Dictionary of Contemporary English ▲