airtight

[ air-tahyt ]
/ ˈɛərˌtaɪt /

adjective

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.

Origin of airtight

First recorded in 1750–60; air1 + tight
Related formsair·tight·ly, adverbair·tight·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for airtight

airtight

/ (ˈɛəˌtaɪt) /

adjective

not permitting the passage of air either in or out
having no weak points; rigid or unassailablethis 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

Word Origin and History for airtight

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