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English definition of “airtight”

airtight

adjective     /ˈeə.taɪt/ US  /ˈer-/
completely closed so that no air can get in or out: Biscuits will stay crisp if you keep them in an airtight container.Open and closed
(Definition of airtight adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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