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
If De La Cruz is better to his left because Hayes is on his right, the infield should be relatively airtight with second baseman Matt McLain and Spencer Steer, who has quickly become an exceptional defensive first baseman.
—
C. Trent Rosecrans, New York Times, 31 July 2025
The plastic containers are airtight to keep your food fresh, and each dispenser has adjustable portion-control settings so there’s no overpouring.
—Clint Davis, People.com, 3 July 2025
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
See All Example Sentences for airtight
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C. Trent Rosecrans, New York Times, 31 July 2025
The plastic containers are airtight to keep your food fresh, and each dispenser has adjustable portion-control settings so there’s no overpouring.
—Clint Davis, People.com, 3 July 2025
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
See All Example Sentences for airtight
Cite this Entry
“Airtight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/airtight. Accessed 31 Oct. 2025.
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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