Definition of airtight adjective from the Oxford Advanced American Dictionary

     

    airtight

     adjective
    adjective
    NAmE//ˈɛrtaɪt//
     
     
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  1. 1not allowing air to get in or out Store the cake in an airtight container.
  2. 2(figurative) an airtight alibi (= one that cannot be proved to be false)
See the Oxford Advanced Learner's Dictionary entry: airtight