Definition of airtight adjective from the Oxford Advanced Learner's Dictionary

 

airtight

 adjective
adjective
BrE BrE//ˈeətaɪt//
 
; NAmE NAmE//ˈertaɪt//
 
 
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not allowing air to get in or out Store the cake in an airtight container. (figurative) an airtight alibi (= one that cannot be proved to be false)
See the Oxford Advanced American Dictionary entry: airtight