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airtight

[air-tahyt] /ˈɛərˌtaɪt/
adjective
1.
preventing the entrance or escape of air or gas.
2.
having no weak points or openings of which an opponent may take advantage:
an airtight contract.
Origin of airtight
1750-1760
1750-60; air1 + tight
Related forms
airtightly, adverb
airtightness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for airtight

airtight

/ˈɛəˌtaɪt/
adjective
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for airtight
adj.

also air-tight, "impervious to air," 1760, from air (n.1) + tight. Figurative sense of "incontrovertible" (of arguments, alabis, etc.) is from 1929.

Online Etymology Dictionary, © 2010 Douglas Harper
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