preventing the entrance or escape of air or gas.
having no weak points or openings of which an opponent may take advantage: an airtight contract.

1750–60; air1 + tight

airtightly, adverb
airtightness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
airtight (ˈɛəˌtaɪt)
1.  not permitting the passage of air either in or out
2.  having no weak points; rigid or unassailable: this categorization is hardly airtight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"impervious to air," 1760, from air (1) + tight. Fig. sense of "incontrovertible" (of arguments, alabis, etc.) is from 1929.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Taking no chances, they put on airtight moon suits and disappeared into a
  sealed examining chamber to work on the body.
Flex-duct takeoffs, while often airtight in appearance, can have substantial
  leakage and should be sealed with mastic.
The one flaw in an otherwise airtight sitcom premise.
Those in law-enforcement circles had long believed that there would be no
  indictment without an airtight case.
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