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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for airtight

Contemporary Examples of airtight

Historical Examples of airtight

  • I give you my word I could feel myself heatin' up like an airtight stove.


    Joseph C. Lincoln

  • The mild aroma of Heerenbaai-Tabak filled the airtight groundcar.


    Charles Louis Fontenay

  • It was not airtight, but there would probably be no further investigation.

    The Perfectionists

    Arnold Castle

  • The bodies had been walled in well enough, but those walls were not airtight.

    The Iron Ration

    George Abel Schreiner

  • It was airtight above or below that one spot on the throttle.

    Test Pilot

    David Goodger (

British Dictionary definitions for airtight



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

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