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.
Then I immediately go home and slice them in half and wrap them in cling wrap and put them in an airtight Ziploc baggie and throw them in the freezer.
From Los Angeles Times ● Oct. 20, 2026
To confirm their findings, the team also used an independent measurement technique involving airtight chambers placed directly on the soil surface.
From Science Daily ● Oct. 17, 2026
The most expensive purchase, she calculates, were the windows at £30,000, while one of the cheapest measures was making the whole house airtight, which cost £5,000.
From BBC ● Aug. 21, 2026
Tactics include fake-out venues, airtight NDAs and underground exits.
From The Wall Street Journal ● Jul. 2, 2026
The mouse, I’ve been sure for years, limps home from the site of the burning ferns wheel with a brand-new, airtight plan for killing the cat.
From "Nine Stories" by J. D. Salinger
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Get a wordDefinitions 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.
