airtight
Americanadjective
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preventing the entrance or escape of air or gas.
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having no weak points or openings of which an opponent may take advantage.
an airtight contract.
adjective
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not permitting the passage of air either in or out
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having no weak points; rigid or unassailable
this categorization is hardly airtight
Other Word Forms
Etymology
Origin of airtight
Explanation
If something's airtight, it is completely sealed so that no air can get in or out of it. When you make homemade jam with the raspberries you picked, it's important to make sure the lids are airtight so the jam won't spoil. Many kinds of food and medicine you buy in a store are airtight. The airtight seal on a package, bag, or can assures you that the contents are safe from any germs that might get in and contaminate them. You can also use this adjective to mean "certain" or "indisputable," like an airtight alibi that can't be argued with, or an airtight plan that's guaranteed to work.
Vocabulary lists containing airtight
Everything, Everything
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"My Brother's Keeper" and "What Price Loyalty?"
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Z for Zachariah
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
It’s also safe to eat for three to four days, provided the chicken is stored properly in shallow, airtight containers rather than in its original plastic packaging.
From Salon ● Jun. 29, 2026
Fischer added that companies now have to implement trading policies that extend to prediction markets, though such policies often aren’t airtight.
From MarketWatch ● May 28, 2026
He delivered an airtight opening argument that was stunning for how much stronger it was than opposing coach Ime Udoka’s.
From Los Angeles Times ● Apr. 24, 2026
His reasoning is pretty airtight: The Virginia Constitution says exactly when the “general election” was held for legal purposes, and it was Nov. 4, 2025.
From Slate ● Apr. 24, 2026
Special seal-strips between the patches ensured airtight mating.
From "The Martian" by Andy Weir
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
