1
: impermeable to air or nearly so
an airtight seal
2
a
: having no noticeable weakness, flaw, or loophole
an airtight argument
b
: permitting no opportunity for an opponent to score
an airtight defense
airtightness
noun
Examples of airtight in a Sentence
Store the food in an airtight container.
The defendant had an airtight alibi.
Recent Examples on the Web
Natural corks, while not entirely airtight, typically allow only a minimal amount of oxygen to enter over time.
—
Roger Dooley, Forbes, 12 Dec. 2024
The neighbor’s sign, while biting, underscored an emerging reality in Arizona’s sizable Latter-day Saints community — that while church members are overwhelmingly Republican, there is some erosion in their traditionally airtight support for Republicans.
—Faith E. Pinho, Los Angeles Times, 13 Oct. 2024
These passed our leak test, but our avocado browned quite a bit overnight, suggesting that these containers aren’t entirely airtight.
—Lizzy Briskin, Peoplemag, 9 Sep. 2024
But the United States' employment verification scheme is hardly airtight.
—Edward Alden, Foreign Affairs, 11 Feb. 2013
See all Example Sentences for airtight 
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Roger Dooley, Forbes, 12 Dec. 2024
The neighbor’s sign, while biting, underscored an emerging reality in Arizona’s sizable Latter-day Saints community — that while church members are overwhelmingly Republican, there is some erosion in their traditionally airtight support for Republicans.
—Faith E. Pinho, Los Angeles Times, 13 Oct. 2024
These passed our leak test, but our avocado browned quite a bit overnight, suggesting that these containers aren’t entirely airtight.
—Lizzy Briskin, Peoplemag, 9 Sep. 2024
But the United States' employment verification scheme is hardly airtight.
—Edward Alden, Foreign Affairs, 11 Feb. 2013
See all Example Sentences for airtight
Dictionary Entries Near airtight
Cite this Entry
“Airtight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/airtight. Accessed 31 Dec. 2024.
Copy CitationKids Definition
airtight
adjective
air·tight
-ˈtīt 
1
: so tightly sealed that no air can get in or out
an airtight container
2
: too strong or effective to fail or be defeated
an airtight argument
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