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air tightness

 [air-tahyt]   Origin

air·tight

   [air-tahyt]
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.
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Origin:
1750–60; air1 + tight

Related forms
air·tight·ly, adverb
air·tight·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Air tightness is always a great word to know.
So is interrobang. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Etymonline
Word Origin & History

airtight
"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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